diff --git a/app/Actions/Notifications/BuildProjectNotificationSettingsPayload.php b/app/Actions/Notifications/BuildProjectNotificationSettingsPayload.php
index 19d9cf8..ef2a338 100644
--- a/app/Actions/Notifications/BuildProjectNotificationSettingsPayload.php
+++ b/app/Actions/Notifications/BuildProjectNotificationSettingsPayload.php
@@ -60,7 +60,7 @@ class BuildProjectNotificationSettingsPayload
                 'value' => '$project_name',
             ],
             [
-                'description' => 'Origin status label for status moves; blank for ticket create.',
+                'description' => 'Origin status label for status moves; blank for ticket create and assignee changes.',
                 'value' => '$status_from',
             ],
             [
@@ -71,6 +71,14 @@ class BuildProjectNotificationSettingsPayload
                 'description' => 'Actor name when the event has a known user.',
                 'value' => '$actor_name',
             ],
+            [
+                'description' => 'Previous assignee name when the event updates assignment; blank otherwise.',
+                'value' => '$assignee_from',
+            ],
+            [
+                'description' => 'New assignee name when the event updates assignment; blank when unassigned.',
+                'value' => '$assignee_to',
+            ],
         ];
     }
 }
diff --git a/app/Actions/Notifications/BuildTicketAssigneeChangedPayload.php b/app/Actions/Notifications/BuildTicketAssigneeChangedPayload.php
new file mode 100644
index 0000000..75e8e3e
--- /dev/null
+++ b/app/Actions/Notifications/BuildTicketAssigneeChangedPayload.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Actions\Notifications;
+
+use App\Models\Project;
+use App\Models\Ticket;
+use App\Models\TicketStatus;
+use App\Models\User;
+use Carbon\CarbonImmutable;
+
+class BuildTicketAssigneeChangedPayload
+{
+    public function handle(
+        Project $project,
+        Ticket $ticket,
+        ?User $actor,
+        ?int $fromAssigneeId,
+        ?string $fromAssigneeName,
+        ?int $toAssigneeId,
+        ?string $toAssigneeName,
+        CarbonImmutable $occurredAt,
+    ): TicketAssigneeChangedPayload {
+        $ticket->loadMissing('ticketStatus.boardColumn');
+
+        return new TicketAssigneeChangedPayload(
+            projectId: $project->id,
+            projectKey: $project->key,
+            projectName: $project->name,
+            ticketId: $ticket->id,
+            ticketKey: $ticket->ticket_key,
+            ticketTitle: $ticket->title,
+            ticketUrl: route('projects.tickets.show', [$project, $ticket]),
+            actorId: $actor?->id,
+            actorName: $actor?->name,
+            fromStatusId: null,
+            fromStatusLabel: null,
+            toStatusId: $ticket->ticket_status_id,
+            toStatusLabel: $this->statusLabel($ticket->ticketStatus),
+            occurredAt: $occurredAt,
+            fromAssigneeId: $fromAssigneeId,
+            fromAssigneeName: $fromAssigneeName,
+            toAssigneeId: $toAssigneeId,
+            toAssigneeName: $toAssigneeName,
+        );
+    }
+
+    private function statusLabel(?TicketStatus $ticketStatus): string
+    {
+        if ($ticketStatus === null) {
+            return 'Unknown status';
+        }
+
+        $ticketStatus->loadMissing('boardColumn');
+
+        if ($ticketStatus->boardColumn === null || $ticketStatus->boardColumn->name === $ticketStatus->name) {
+            return $ticketStatus->name;
+        }
+
+        return "{$ticketStatus->boardColumn->name} / {$ticketStatus->name}";
+    }
+}
diff --git a/app/Actions/Notifications/MatchNotificationFilters.php b/app/Actions/Notifications/MatchNotificationFilters.php
index 68ac489..9553370 100644
--- a/app/Actions/Notifications/MatchNotificationFilters.php
+++ b/app/Actions/Notifications/MatchNotificationFilters.php
@@ -190,6 +190,10 @@ class MatchNotificationFilters
         $fromStatusLabel = property_exists($payload, 'fromStatusLabel') ? $payload->fromStatusLabel : null;
         $toStatusId = property_exists($payload, 'toStatusId') ? $payload->toStatusId : null;
         $toStatusLabel = property_exists($payload, 'toStatusLabel') ? $payload->toStatusLabel : null;
+        $fromAssigneeId = property_exists($payload, 'fromAssigneeId') ? $payload->fromAssigneeId : null;
+        $fromAssigneeName = property_exists($payload, 'fromAssigneeName') ? $payload->fromAssigneeName : null;
+        $toAssigneeId = property_exists($payload, 'toAssigneeId') ? $payload->toAssigneeId : null;
+        $toAssigneeName = property_exists($payload, 'toAssigneeName') ? $payload->toAssigneeName : null;
 
         return [
             'project' => [
@@ -207,6 +211,16 @@ class MatchNotificationFilters
                 'id' => $actorId,
                 'name' => $actorName,
             ],
+            'assignee' => [
+                'from' => [
+                    'id' => $fromAssigneeId,
+                    'name' => $fromAssigneeName,
+                ],
+                'to' => [
+                    'id' => $toAssigneeId,
+                    'name' => $toAssigneeName,
+                ],
+            ],
             'status' => [
                 'from' => [
                     'id' => $fromStatusId,
diff --git a/app/Actions/Notifications/TicketAssigneeChanged.php b/app/Actions/Notifications/TicketAssigneeChanged.php
new file mode 100644
index 0000000..d49643e
--- /dev/null
+++ b/app/Actions/Notifications/TicketAssigneeChanged.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Actions\Notifications;
+
+use App\Enums\NotificationEventType;
+use Illuminate\Contracts\Events\ShouldDispatchAfterCommit;
+use Illuminate\Foundation\Events\Dispatchable;
+
+final readonly class TicketAssigneeChanged implements NotificationEvent, ShouldDispatchAfterCommit
+{
+    use Dispatchable;
+
+    public function __construct(
+        public TicketAssigneeChangedPayload $payload,
+    ) {}
+
+    public function eventType(): NotificationEventType
+    {
+        return NotificationEventType::TicketAssigneeChanged;
+    }
+
+    public function payload(): NotificationEventPayload
+    {
+        return $this->payload;
+    }
+}
diff --git a/app/Actions/Notifications/TicketAssigneeChangedPayload.php b/app/Actions/Notifications/TicketAssigneeChangedPayload.php
new file mode 100644
index 0000000..0eceb6b
--- /dev/null
+++ b/app/Actions/Notifications/TicketAssigneeChangedPayload.php
@@ -0,0 +1,129 @@
+<?php
+
+namespace App\Actions\Notifications;
+
+use App\Enums\NotificationEventType;
+use Carbon\CarbonImmutable;
+
+final readonly class TicketAssigneeChangedPayload implements NotificationEventPayload
+{
+    public function __construct(
+        public int $projectId,
+        public string $projectKey,
+        public string $projectName,
+        public int $ticketId,
+        public string $ticketKey,
+        public string $ticketTitle,
+        public string $ticketUrl,
+        public ?int $actorId,
+        public ?string $actorName,
+        public ?int $fromStatusId,
+        public ?string $fromStatusLabel,
+        public int $toStatusId,
+        public string $toStatusLabel,
+        public CarbonImmutable $occurredAt,
+        public ?int $fromAssigneeId,
+        public ?string $fromAssigneeName,
+        public ?int $toAssigneeId,
+        public ?string $toAssigneeName,
+    ) {}
+
+    public function projectId(): int
+    {
+        return $this->projectId;
+    }
+
+    /**
+     * @return array<string, scalar|null>
+     */
+    public function deliveryMetadata(): array
+    {
+        return [
+            'project_key' => $this->projectKey,
+            'ticket_key' => $this->ticketKey,
+        ];
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function discordTemplateVariables(): array
+    {
+        return [
+            '$url' => $this->ticketUrl,
+            '$ticket_key' => $this->ticketKey,
+            '$ticket_title' => $this->ticketTitle,
+            '$project_name' => $this->projectName,
+            '$status_from' => $this->fromStatusLabel ?? '',
+            '$status_to' => $this->toStatusLabel,
+            '$actor_name' => $this->actorName ?? '',
+            '$assignee_from' => $this->fromAssigneeName ?? '',
+            '$assignee_to' => $this->toAssigneeName ?? '',
+        ];
+    }
+
+    /**
+     * @return array{
+     *     event_type: string,
+     *     project: array{id: int, key: string, name: string},
+     *     ticket: array{id: int, key: string, title: string},
+     *     actor: array{id: int, name: string}|null,
+     *     assignee: array{
+     *         from: array{id: int, name: string}|null,
+     *         to: array{id: int, name: string}|null
+     *     },
+     *     from: array{id: int, label: string}|null,
+     *     to: array{id: int, label: string},
+     *     ticket_url: string,
+     *     occurred_at: string
+     * }
+     */
+    public function toArray(): array
+    {
+        return [
+            'event_type' => NotificationEventType::TicketAssigneeChanged->value,
+            'project' => [
+                'id' => $this->projectId,
+                'key' => $this->projectKey,
+                'name' => $this->projectName,
+            ],
+            'ticket' => [
+                'id' => $this->ticketId,
+                'key' => $this->ticketKey,
+                'title' => $this->ticketTitle,
+            ],
+            'actor' => $this->actorId === null || $this->actorName === null
+                ? null
+                : [
+                    'id' => $this->actorId,
+                    'name' => $this->actorName,
+                ],
+            'assignee' => [
+                'from' => $this->fromAssigneeId === null || $this->fromAssigneeName === null
+                    ? null
+                    : [
+                        'id' => $this->fromAssigneeId,
+                        'name' => $this->fromAssigneeName,
+                    ],
+                'to' => $this->toAssigneeId === null || $this->toAssigneeName === null
+                    ? null
+                    : [
+                        'id' => $this->toAssigneeId,
+                        'name' => $this->toAssigneeName,
+                    ],
+            ],
+            'from' => $this->fromStatusId === null || $this->fromStatusLabel === null
+                ? null
+                : [
+                    'id' => $this->fromStatusId,
+                    'label' => $this->fromStatusLabel,
+                ],
+            'to' => [
+                'id' => $this->toStatusId,
+                'label' => $this->toStatusLabel,
+            ],
+            'ticket_url' => $this->ticketUrl,
+            'occurred_at' => $this->occurredAt->toISOString(),
+        ];
+    }
+}
diff --git a/app/Actions/Tickets/UpdateProjectTicket.php b/app/Actions/Tickets/UpdateProjectTicket.php
index d4e8a2a..5207647 100644
--- a/app/Actions/Tickets/UpdateProjectTicket.php
+++ b/app/Actions/Tickets/UpdateProjectTicket.php
@@ -2,12 +2,15 @@
 
 namespace App\Actions\Tickets;
 
+use App\Actions\Notifications\BuildTicketAssigneeChangedPayload;
+use App\Actions\Notifications\TicketAssigneeChanged;
 use App\Actions\Tickets\Support\AcceptanceCriteriaChecklistMapper;
 use App\Enums\TicketWorklogEntryType;
 use App\Models\Ticket;
 use App\Models\TicketFieldDefinition;
 use App\Models\TicketFieldValue;
 use App\Models\User;
+use Carbon\CarbonImmutable;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\DB;
@@ -15,6 +18,7 @@ use Illuminate\Support\Facades\DB;
 class UpdateProjectTicket
 {
     public function __construct(
+        private readonly BuildTicketAssigneeChangedPayload $buildTicketAssigneeChangedPayload,
         private readonly CreateTicketWorklogEntry $createTicketWorklogEntry,
         private readonly SyncProjectTicketFieldValues $syncProjectTicketFieldValues,
     ) {}
@@ -68,6 +72,7 @@ class UpdateProjectTicket
                 'parentTicket',
                 'project',
                 'ticketPriority',
+                'ticketStatus.boardColumn',
                 'ticketType',
             ]);
 
@@ -90,6 +95,7 @@ class UpdateProjectTicket
 
             $changes = [];
             $summaryLabels = [];
+            $assigneeChange = null;
 
             $this->trackScalarChange(
                 $changes,
@@ -167,13 +173,23 @@ class UpdateProjectTicket
             }
 
             if ($ticket->assignee_user_id !== $ticketAttributes['assignee_user_id']) {
+                $toAssigneeId = $ticketAttributes['assignee_user_id'];
+                $toAssigneeName = $toAssigneeId === null
+                    ? null
+                    : User::query()->find($toAssigneeId)?->name;
+
                 $changes['assignee'] = [
                     'from' => $ticket->assignee?->name,
-                    'to' => $ticketAttributes['assignee_user_id'] === null
-                        ? null
-                        : User::query()->find($ticketAttributes['assignee_user_id'])?->name,
+                    'to' => $toAssigneeName,
                 ];
                 $summaryLabels[] = 'assignee';
+
+                $assigneeChange = [
+                    'from_id' => $ticket->assignee_user_id,
+                    'from_name' => $ticket->assignee?->name,
+                    'to_id' => $toAssigneeId,
+                    'to_name' => $toAssigneeName,
+                ];
             }
 
             if ($ticket->author_user_id !== $ticketAttributes['author_user_id']) {
@@ -223,6 +239,21 @@ class UpdateProjectTicket
                 $changes,
             );
 
+            if ($assigneeChange !== null) {
+                TicketAssigneeChanged::dispatch(
+                    $this->buildTicketAssigneeChangedPayload->handle(
+                        $ticket->project,
+                        $ticket,
+                        $actor,
+                        $assigneeChange['from_id'],
+                        $assigneeChange['from_name'],
+                        $assigneeChange['to_id'],
+                        $assigneeChange['to_name'],
+                        CarbonImmutable::now(),
+                    ),
+                );
+            }
+
             return true;
         });
     }
diff --git a/app/Enums/NotificationEventType.php b/app/Enums/NotificationEventType.php
index 629e2af..2da3dfa 100644
--- a/app/Enums/NotificationEventType.php
+++ b/app/Enums/NotificationEventType.php
@@ -6,12 +6,14 @@ enum NotificationEventType: string
 {
     case TicketStatusChanged = 'ticket_status_changed';
     case TicketCreate = 'ticket_create';
+    case TicketAssigneeChanged = 'ticket_assignee_changed';
 
     public function label(): string
     {
         return match ($this) {
             self::TicketStatusChanged => 'Ticket status changed',
             self::TicketCreate => 'Ticket create',
+            self::TicketAssigneeChanged => 'Assignee changed',
         };
     }
 
diff --git a/app/Enums/NotificationFilterAttribute.php b/app/Enums/NotificationFilterAttribute.php
index bcd9305..3eedd91 100644
--- a/app/Enums/NotificationFilterAttribute.php
+++ b/app/Enums/NotificationFilterAttribute.php
@@ -13,6 +13,10 @@ enum NotificationFilterAttribute: string
     case TicketUrl = 'ticket.url';
     case ActorId = 'actor.id';
     case ActorName = 'actor.name';
+    case AssigneeFromId = 'assignee.from.id';
+    case AssigneeFromName = 'assignee.from.name';
+    case AssigneeToId = 'assignee.to.id';
+    case AssigneeToName = 'assignee.to.name';
     case StatusFromId = 'status.from.id';
     case StatusFromLabel = 'status.from.label';
     case StatusToId = 'status.to.id';
@@ -30,6 +34,10 @@ enum NotificationFilterAttribute: string
             self::TicketUrl => 'Ticket URL',
             self::ActorId => 'Actor ID',
             self::ActorName => 'Actor name',
+            self::AssigneeFromId => 'From assignee ID',
+            self::AssigneeFromName => 'From assignee name',
+            self::AssigneeToId => 'To assignee ID',
+            self::AssigneeToName => 'To assignee name',
             self::StatusFromId => 'From status ID',
             self::StatusFromLabel => 'From status label',
             self::StatusToId => 'To status ID',
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index c8685f8..e2489fa 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -3,6 +3,7 @@
 namespace App\Providers;
 
 use App\Actions\Notifications\QueueNotificationEventDeliveries;
+use App\Actions\Notifications\TicketAssigneeChanged;
 use App\Actions\Notifications\TicketCreated;
 use App\Actions\Notifications\TicketStatusChanged;
 use App\Actions\Permissions\PermissionService;
@@ -105,5 +106,10 @@ class AppServiceProvider extends ServiceProvider
             TicketCreated::class,
             QueueNotificationEventDeliveries::class,
         );
+
+        Event::listen(
+            TicketAssigneeChanged::class,
+            QueueNotificationEventDeliveries::class,
+        );
     }
 }
diff --git a/tests/Feature/Notifications/RenderDiscordMessageTemplateTest.php b/tests/Feature/Notifications/RenderDiscordMessageTemplateTest.php
index 6f21c71..2ff69b9 100644
--- a/tests/Feature/Notifications/RenderDiscordMessageTemplateTest.php
+++ b/tests/Feature/Notifications/RenderDiscordMessageTemplateTest.php
@@ -3,8 +3,8 @@
 namespace Tests\Feature\Notifications;
 
 use App\Actions\Notifications\RenderDiscordMessageTemplate;
-use App\Actions\Notifications\TicketStatusChanged;
-use App\Actions\Notifications\TicketStatusChangedPayload;
+use App\Actions\Notifications\TicketAssigneeChanged;
+use App\Actions\Notifications\TicketAssigneeChangedPayload;
 use Carbon\CarbonImmutable;
 use PHPUnit\Framework\Attributes\DataProvider;
 use Tests\TestCase;
@@ -45,6 +45,14 @@ class RenderDiscordMessageTemplateTest extends TestCase
                 'template' => '$actor_name',
                 'expected' => 'Erica Example',
             ],
+            'assignee_from' => [
+                'template' => '$assignee_from',
+                'expected' => 'Alex Analyst',
+            ],
+            'assignee_to' => [
+                'template' => '$assignee_to',
+                'expected' => 'Priya Planner',
+            ],
         ];
     }
 
@@ -72,9 +80,9 @@ class RenderDiscordMessageTemplateTest extends TestCase
         $this->assertSame('[CORE-42] $unknown moved to Doing', $renderedMessage);
     }
 
-    private function event(): TicketStatusChanged
+    private function event(): TicketAssigneeChanged
     {
-        return new TicketStatusChanged(new TicketStatusChangedPayload(
+        return new TicketAssigneeChanged(new TicketAssigneeChangedPayload(
             projectId: 10,
             projectKey: 'CORE',
             projectName: 'Core Platform',
@@ -89,6 +97,10 @@ class RenderDiscordMessageTemplateTest extends TestCase
             toStatusId: 2,
             toStatusLabel: 'Doing',
             occurredAt: CarbonImmutable::parse('2026-04-24T09:15:30+00:00'),
+            fromAssigneeId: 11,
+            fromAssigneeName: 'Alex Analyst',
+            toAssigneeId: 12,
+            toAssigneeName: 'Priya Planner',
         ));
     }
 }
diff --git a/tests/Feature/Notifications/TicketAssigneeChangedNotificationDispatchTest.php b/tests/Feature/Notifications/TicketAssigneeChangedNotificationDispatchTest.php
new file mode 100644
index 0000000..ec8ef39
--- /dev/null
+++ b/tests/Feature/Notifications/TicketAssigneeChangedNotificationDispatchTest.php
@@ -0,0 +1,343 @@
+<?php
+
+namespace Tests\Feature\Notifications;
+
+use App\Actions\Notifications\DeliverNotificationAction;
+use App\Actions\Notifications\TicketAssigneeChangedPayload;
+use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
+use App\Actions\Tickets\Support\AcceptanceCriteriaChecklistMapper;
+use App\Enums\NotificationDeliveryStatus;
+use App\Enums\NotificationEventType;
+use App\Models\NotificationAction;
+use App\Models\Project;
+use App\Models\Ticket;
+use App\Models\TicketPriority;
+use App\Models\TicketStatus;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Queue;
+use Tests\TestCase;
+
+class TicketAssigneeChangedNotificationDispatchTest extends TestCase
+{
+    use RefreshDatabase;
+
+    /**
+     * Ensure assignee changes queue deliveries only for enabled matching actions in the ticket project.
+     */
+    public function test_assignee_changes_queue_delivery_jobs_for_enabled_matching_actions(): void
+    {
+        Queue::fake();
+
+        $actor = User::factory()->create([
+            'name' => 'Erica Example',
+        ]);
+        $fromAssignee = User::factory()->create([
+            'name' => 'Alex Analyst',
+        ]);
+        $toAssignee = User::factory()->create([
+            'name' => 'Priya Planner',
+        ]);
+        $project = Project::factory()->create([
+            'key' => 'CORE',
+            'name' => 'Core Platform',
+        ]);
+        $otherProject = Project::factory()->create();
+
+        app(InitializeProjectTicketMetadata::class)->handle($project);
+        app(InitializeProjectTicketMetadata::class)->handle($otherProject);
+
+        $backlogStatus = $this->backlogStatus($project);
+        $ticket = $this->createTicket(
+            $project,
+            $backlogStatus,
+            'Fix webhook dispatch',
+            $fromAssignee,
+        );
+
+        $webhookAction = NotificationAction::factory()
+            ->webhook()
+            ->for($project)
+            ->create([
+                'name' => 'Primary webhook',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+            ]);
+        $discordAction = NotificationAction::factory()
+            ->discord()
+            ->for($project)
+            ->create([
+                'name' => 'Discord alerts',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+            ]);
+        $disabledAction = NotificationAction::factory()
+            ->disabled()
+            ->for($project)
+            ->create([
+                'name' => 'Disabled webhook',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+            ]);
+        $statusChangedAction = NotificationAction::factory()
+            ->for($project)
+            ->create([
+                'name' => 'Status changed webhook',
+                'event_type' => NotificationEventType::TicketStatusChanged,
+            ]);
+        $filterEqualsAction = NotificationAction::factory()
+            ->webhook()
+            ->for($project)
+            ->create([
+                'name' => 'Filtered to assignee webhook',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+                'filters' => [
+                    [
+                        'attribute' => 'assignee.to.id',
+                        'operator' => 'equals',
+                        'value' => (string) $toAssignee->id,
+                    ],
+                ],
+            ]);
+        $filterExistsAction = NotificationAction::factory()
+            ->webhook()
+            ->for($project)
+            ->create([
+                'name' => 'Filtered from assignee exists webhook',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+                'filters' => [
+                    [
+                        'attribute' => 'assignee.from.id',
+                        'operator' => 'exists',
+                        'value' => null,
+                    ],
+                ],
+            ]);
+        $filterNotExistsAction = NotificationAction::factory()
+            ->webhook()
+            ->for($project)
+            ->create([
+                'name' => 'Filtered from assignee not exists webhook',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+                'filters' => [
+                    [
+                        'attribute' => 'assignee.from.id',
+                        'operator' => 'not_exists',
+                        'value' => null,
+                    ],
+                ],
+            ]);
+        $filterInAction = NotificationAction::factory()
+            ->webhook()
+            ->for($project)
+            ->create([
+                'name' => 'Filtered in assignee webhook',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+                'filters' => [
+                    [
+                        'attribute' => 'assignee.to.name',
+                        'operator' => 'in',
+                        'value' => ['Priya Planner', 'Someone Else'],
+                    ],
+                ],
+            ]);
+        $foreignProjectAction = NotificationAction::factory()
+            ->for($otherProject)
+            ->create([
+                'name' => 'Foreign webhook',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+            ]);
+
+        $this->syncProjectPermissions($project, $actor, ['edit', 'view']);
+
+        $this->actingAs($actor)
+            ->patch(route('projects.tickets.update', [$project, $ticket]), $this->updatePayload($ticket, [
+                'assignee_user_id' => $toAssignee->id,
+            ]))
+            ->assertRedirect(route('projects.tickets.show', [$project, $ticket]))
+            ->assertSessionHas('status', 'CORE-1 was updated.');
+
+        Queue::assertPushed(DeliverNotificationAction::class, 5);
+        Queue::assertPushed(DeliverNotificationAction::class, function (DeliverNotificationAction $job) use ($actor, $backlogStatus, $fromAssignee, $project, $ticket, $toAssignee, $webhookAction): bool {
+            $payload = $job->event->payload();
+
+            return $job->notificationActionId === $webhookAction->id
+                && $payload instanceof TicketAssigneeChangedPayload
+                && $payload->projectId === $project->id
+                && $payload->projectKey === 'CORE'
+                && $payload->projectName === 'Core Platform'
+                && $payload->ticketId === $ticket->id
+                && $payload->ticketKey === 'CORE-1'
+                && $payload->ticketTitle === 'Fix webhook dispatch'
+                && $payload->ticketUrl === route('projects.tickets.show', [$project, $ticket])
+                && $payload->actorId === $actor->id
+                && $payload->actorName === 'Erica Example'
+                && $payload->fromStatusId === null
+                && $payload->fromStatusLabel === null
+                && $payload->toStatusId === $backlogStatus->id
+                && $payload->toStatusLabel === 'Backlog'
+                && $payload->fromAssigneeId === $fromAssignee->id
+                && $payload->fromAssigneeName === 'Alex Analyst'
+                && $payload->toAssigneeId === $toAssignee->id
+                && $payload->toAssigneeName === 'Priya Planner'
+                && $payload->toArray()['event_type'] === NotificationEventType::TicketAssigneeChanged->value
+                && $job->notificationDeliveryLogId !== null;
+        });
+        Queue::assertPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $discordAction->id
+            && $job->event->eventType() === NotificationEventType::TicketAssigneeChanged
+            && $job->notificationDeliveryLogId !== null);
+        Queue::assertPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $filterEqualsAction->id
+            && $job->event->eventType() === NotificationEventType::TicketAssigneeChanged
+            && $job->notificationDeliveryLogId !== null);
+        Queue::assertPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $filterExistsAction->id
+            && $job->event->eventType() === NotificationEventType::TicketAssigneeChanged
+            && $job->notificationDeliveryLogId !== null);
+        Queue::assertPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $filterInAction->id
+            && $job->event->eventType() === NotificationEventType::TicketAssigneeChanged
+            && $job->notificationDeliveryLogId !== null);
+        Queue::assertNotPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $disabledAction->id);
+        Queue::assertNotPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $statusChangedAction->id);
+        Queue::assertNotPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $filterNotExistsAction->id);
+        Queue::assertNotPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $foreignProjectAction->id);
+
+        $this->assertDatabaseCount('notification_delivery_logs', 5);
+        $this->assertDatabaseHas('notification_delivery_logs', [
+            'notification_action_id' => $webhookAction->id,
+            'delivery_status' => NotificationDeliveryStatus::Pending->value,
+            'event_type' => NotificationEventType::TicketAssigneeChanged->value,
+            'attempt_count' => 0,
+            'http_status' => null,
+        ]);
+        $this->assertDatabaseHas('notification_delivery_logs', [
+            'notification_action_id' => $discordAction->id,
+            'delivery_status' => NotificationDeliveryStatus::Pending->value,
+            'event_type' => NotificationEventType::TicketAssigneeChanged->value,
+            'attempt_count' => 0,
+            'http_status' => null,
+        ]);
+        $this->assertDatabaseHas('notification_delivery_logs', [
+            'notification_action_id' => $filterEqualsAction->id,
+            'delivery_status' => NotificationDeliveryStatus::Pending->value,
+            'event_type' => NotificationEventType::TicketAssigneeChanged->value,
+            'attempt_count' => 0,
+            'http_status' => null,
+        ]);
+        $this->assertDatabaseHas('notification_delivery_logs', [
+            'notification_action_id' => $filterExistsAction->id,
+            'delivery_status' => NotificationDeliveryStatus::Pending->value,
+            'event_type' => NotificationEventType::TicketAssigneeChanged->value,
+            'attempt_count' => 0,
+            'http_status' => null,
+        ]);
+        $this->assertDatabaseHas('notification_delivery_logs', [
+            'notification_action_id' => $filterInAction->id,
+            'delivery_status' => NotificationDeliveryStatus::Pending->value,
+            'event_type' => NotificationEventType::TicketAssigneeChanged->value,
+            'attempt_count' => 0,
+            'http_status' => null,
+        ]);
+
+        $this->assertDatabaseHas('ticket_worklog_entries', [
+            'ticket_id' => $ticket->id,
+            'actor_id' => $actor->id,
+            'entry_type' => 'updated',
+            'summary' => 'Updated assignee.',
+        ]);
+    }
+
+    /**
+     * Ensure no-op assignee updates keep their response behavior and do not queue deliveries.
+     */
+    public function test_no_op_assignee_updates_do_not_queue_notification_deliveries(): void
+    {
+        Queue::fake();
+
+        $actor = User::factory()->create();
+        $assignee = User::factory()->create();
+        $project = Project::factory()->create([
+            'key' => 'CORE',
+        ]);
+
+        app(InitializeProjectTicketMetadata::class)->handle($project);
+
+        $backlogStatus = $this->backlogStatus($project);
+        $ticket = $this->createTicket(
+            $project,
+            $backlogStatus,
+            'Keep the same assignee',
+            $assignee,
+        );
+
+        NotificationAction::factory()
+            ->for($project)
+            ->create([
+                'name' => 'Assignee webhook',
+                'event_type' => NotificationEventType::TicketAssigneeChanged,
+            ]);
+
+        $this->syncProjectPermissions($project, $actor, ['edit', 'view']);
+
+        $this->actingAs($actor)
+            ->patch(route('projects.tickets.update', [$project, $ticket]), $this->updatePayload($ticket, [
+                'assignee_user_id' => $assignee->id,
+            ]))
+            ->assertRedirect(route('projects.tickets.show', [$project, $ticket]))
+            ->assertSessionHas('status', 'No ticket changes were detected.');
+
+        Queue::assertNothingPushed();
+        $this->assertDatabaseCount('notification_delivery_logs', 0);
+        $this->assertDatabaseCount('ticket_worklog_entries', 0);
+    }
+
+    private function backlogStatus(Project $project): TicketStatus
+    {
+        return $project->ticketStatuses()
+            ->whereNull('board_column_id')
+            ->firstOrFail();
+    }
+
+    private function createTicket(
+        Project $project,
+        TicketStatus $ticketStatus,
+        string $title,
+        ?User $assignee = null,
+    ): Ticket {
+        $priority = TicketPriority::factory()->for($project)->create([
+            'name' => 'High',
+            'position' => 2,
+        ]);
+
+        return Ticket::factory()->create([
+            'assignee_user_id' => $assignee?->id,
+            'project_id' => $project->id,
+            'sequence_number' => 1,
+            'ticket_key' => 'CORE-1',
+            'ticket_priority_id' => $priority->id,
+            'ticket_status_id' => $ticketStatus->id,
+            'ticket_type_id' => $project->ticketTypes()->firstOrFail()->id,
+            'title' => $title,
+        ]);
+    }
+
+    /**
+     * @param  array<string, mixed>  $overrides
+     * @return array<string, mixed>
+     */
+    private function updatePayload(Ticket $ticket, array $overrides = []): array
+    {
+        return [
+            'acceptance_criteria' => AcceptanceCriteriaChecklistMapper::fromModels(
+                $ticket->acceptanceCriteria()->get(),
+            ),
+            'assignee_user_id' => $ticket->assignee_user_id,
+            'author_user_id' => $ticket->author_user_id,
+            'blocked_comment' => $ticket->blocked_comment,
+            'description' => $ticket->description,
+            'field_values' => [],
+            'is_blocked' => $ticket->is_blocked,
+            'parent_ticket_id' => $ticket->parent_ticket_id,
+            'story_points' => $ticket->story_points,
+            'ticket_priority_id' => $ticket->ticket_priority_id,
+            'ticket_type_id' => $ticket->ticket_type_id,
+            'title' => $ticket->title,
+            ...$overrides,
+        ];
+    }
+}
diff --git a/tests/Feature/Projects/ProjectNotificationSettingsControllerTest.php b/tests/Feature/Projects/ProjectNotificationSettingsControllerTest.php
index d92e5e3..5d2c362 100644
--- a/tests/Feature/Projects/ProjectNotificationSettingsControllerTest.php
+++ b/tests/Feature/Projects/ProjectNotificationSettingsControllerTest.php
@@ -63,12 +63,15 @@ class ProjectNotificationSettingsControllerTest extends TestCase
                 ->where('channelOptions.0.value', NotificationChannel::Discord->value)
                 ->where('eventTypeOptions.0.value', NotificationEventType::TicketStatusChanged->value)
                 ->where('eventTypeOptions.1.value', NotificationEventType::TicketCreate->value)
+                ->where('eventTypeOptions.2.value', NotificationEventType::TicketAssigneeChanged->value)
                 ->where('discordAllowedMentionOptions.0.value', 'everyone')
                 ->where('discordAllowedMentionOptions.2.value', 'users')
                 ->where('filterAttributeOptions.0.value', 'project.id')
                 ->where('filterOperatorOptions.0.value', 'equals')
                 ->where('templateVariables.0.value', '$url')
                 ->where('templateVariables.6.value', '$actor_name')
+                ->where('templateVariables.7.value', '$assignee_from')
+                ->where('templateVariables.8.value', '$assignee_to')
                 ->missing('notificationActions.0.delivery_url'),
             );
     }