diff --git a/app/Models/Audit.php b/app/Models/Audit.php
index c7466715..312ff0db 100644
--- a/app/Models/Audit.php
+++ b/app/Models/Audit.php
@@ -6,13 +6,14 @@ namespace App\Models;
 
 use Database\Factories\AuditFactory;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Support\Carbon;
 use OwenIt\Auditing\Models\Audit as PackageAuditModel;
 
 /**
  * @property int $id
- * @property string|null $user_type
- * @property string|null $user_id
+ * @property string|null $actor_type
+ * @property string|null $actor_id
  * @property string $event
  * @property string $auditable_type
  * @property string $auditable_id
@@ -22,8 +23,12 @@ use OwenIt\Auditing\Models\Audit as PackageAuditModel;
  * @property string|null $ip_address
  * @property string|null $user_agent
  * @property string|null $tags
+ * @property string|null $owner_user_id
+ * @property string|null $owner_organization_id
  * @property Carbon|null $created_at
  * @property Carbon|null $updated_at
+ * @property-read User|null $ownerUser
+ * @property-read Organization|null $ownerOrganization
  *
  * @method static AuditFactory factory()
  */
@@ -31,4 +36,20 @@ class Audit extends PackageAuditModel
 {
     /** @use HasFactory<AuditFactory> */
     use HasFactory;
+
+    /**
+     * @return BelongsTo<User, $this>
+     */
+    public function ownerUser(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'owner_user_id');
+    }
+
+    /**
+     * @return BelongsTo<Organization, $this>
+     */
+    public function ownerOrganization(): BelongsTo
+    {
+        return $this->belongsTo(Organization::class, 'owner_organization_id');
+    }
 }
diff --git a/app/Models/Concerns/CustomAuditable.php b/app/Models/Concerns/CustomAuditable.php
index af03c25d..150bfb21 100644
--- a/app/Models/Concerns/CustomAuditable.php
+++ b/app/Models/Concerns/CustomAuditable.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Models\Concerns;
 
+use Illuminate\Support\Facades\Config;
 use OwenIt\Auditing\Auditable;
 
 trait CustomAuditable
@@ -19,4 +20,62 @@ trait CustomAuditable
     {
         $this->auditEvents = [];
     }
+
+    /**
+     * The organization that owns the audited model.
+     * The audits of the model are deleted (via foreign key cascade) when the organization is deleted.
+     */
+    public function getAuditOwnerOrganizationId(): ?string
+    {
+        return $this->getAttributes()['organization_id'] ?? null;
+    }
+
+    /**
+     * The user that owns the audited model.
+     * The audits of the model are deleted (via foreign key cascade) when the user is deleted.
+     */
+    public function getAuditOwnerUserId(): ?string
+    {
+        return null;
+    }
+
+    /**
+     * Models that are the owner of their own audits can not record the deletion audit,
+     * since the audit would reference the already deleted model and therefore violate the foreign key.
+     */
+    protected function isAuditOwnerOfItself(): bool
+    {
+        return false;
+    }
+
+    /**
+     * @return array<int|string, string>
+     */
+    public function getAuditEvents(): array
+    {
+        $events = $this->auditEvents ?? Config::get('audit.events', [
+            'created',
+            'updated',
+            'deleted',
+            'restored',
+        ]);
+
+        if ($this->isAuditOwnerOfItself()) {
+            $events = array_filter($events, fn (string $value, int|string $key): bool => (is_int($key) ? $value : $key) !== 'deleted', ARRAY_FILTER_USE_BOTH);
+        }
+
+        return $events;
+    }
+
+    /**
+     * @param  array<string, mixed>  $data
+     * @return array<string, mixed>
+     */
+    public function transformAudit(array $data): array
+    {
+        $data['owner_organization_id'] = $this->getAuditOwnerOrganizationId();
+        $data['owner_user_id'] = $this->getAuditOwnerUserId();
+
+        return $data;
+    }
 }
diff --git a/app/Models/Organization.php b/app/Models/Organization.php
index 06d13c3e..b5f8fc92 100644
--- a/app/Models/Organization.php
+++ b/app/Models/Organization.php
@@ -96,6 +96,16 @@ class Organization extends Model implements AuditableContract
     protected $attributes = [
     ];
 
+    public function getAuditOwnerOrganizationId(): ?string
+    {
+        return $this->getKey();
+    }
+
+    protected function isAuditOwnerOfItself(): bool
+    {
+        return true;
+    }
+
     /**
      * Get all the users that belong to the team.
      *
diff --git a/app/Models/ProjectMember.php b/app/Models/ProjectMember.php
index 698f5bb7..5d45095d 100644
--- a/app/Models/ProjectMember.php
+++ b/app/Models/ProjectMember.php
@@ -82,4 +82,12 @@ class ProjectMember extends Model implements AuditableContract
             $query->whereBelongsTo($organization, 'organization');
         });
     }
+
+    public function getAuditOwnerOrganizationId(): ?string
+    {
+        /** @var string|null $organizationId */
+        $organizationId = Project::query()->whereKey($this->project_id)->value('organization_id');
+
+        return $organizationId;
+    }
 }
diff --git a/app/Models/User.php b/app/Models/User.php
index 3ba34234..9cfd8b9d 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -124,6 +124,16 @@ class User extends Authenticatable implements AuditableContract, FilamentUser, M
         'send_time_entry_still_running_email' => true,
     ];
 
+    public function getAuditOwnerUserId(): ?string
+    {
+        return $this->getKey();
+    }
+
+    protected function isAuditOwnerOfItself(): bool
+    {
+        return true;
+    }
+
     /**
      * Get the URL to the user's profile photo.
      *
diff --git a/config/audit.php b/config/audit.php
index 81fc8076..b0e4ac14 100644
--- a/config/audit.php
+++ b/config/audit.php
@@ -32,7 +32,7 @@ return [
     */
 
     'user' => [
-        'morph_prefix' => 'user',
+        'morph_prefix' => 'actor',
         'guards' => [
             'web',
             'api',
diff --git a/database/migrations/2024_09_02_094105_create_audits_table.php b/database/migrations/2024_09_02_094105_create_audits_table.php
index c8550764..c504b04e 100644
--- a/database/migrations/2024_09_02_094105_create_audits_table.php
+++ b/database/migrations/2024_09_02_094105_create_audits_table.php
@@ -18,7 +18,8 @@ class CreateAuditsTable extends Migration
 
         Schema::connection($connection)->create($table, function (Blueprint $table): void {
 
-            $morphPrefix = config('audit.user.morph_prefix', 'user');
+            // Note: The morph prefix is hardcoded, since the columns are renamed in a later migration
+            $morphPrefix = 'user';
 
             $table->bigIncrements('id');
             $table->string($morphPrefix.'_type')->nullable();
diff --git a/database/migrations/2026_10_06_000001_add_owner_columns_to_audits_table.php b/database/migrations/2026_10_06_000001_add_owner_columns_to_audits_table.php
new file mode 100644
index 00000000..06692ed7
--- /dev/null
+++ b/database/migrations/2026_10_06_000001_add_owner_columns_to_audits_table.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * Note: Renaming columns and adding nullable columns without default are metadata-only operations in PostgreSQL,
+     * so this migration is fast even for a large audits table.
+     * The indexes and foreign keys for the new columns are added in a separate non-transactional migration.
+     */
+    public function up(): void
+    {
+        Schema::table('audits', function (Blueprint $table): void {
+            $table->renameColumn('user_type', 'actor_type');
+            $table->renameColumn('user_id', 'actor_id');
+            $table->renameIndex('audits_user_id_user_type_index', 'audits_actor_id_actor_type_index');
+            $table->uuid('owner_user_id')->nullable();
+            $table->uuid('owner_organization_id')->nullable();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('audits', function (Blueprint $table): void {
+            $table->dropColumn('owner_user_id');
+            $table->dropColumn('owner_organization_id');
+            $table->renameIndex('audits_actor_id_actor_type_index', 'audits_user_id_user_type_index');
+            $table->renameColumn('actor_type', 'user_type');
+            $table->renameColumn('actor_id', 'user_id');
+        });
+    }
+};
diff --git a/database/migrations/2026_10_06_000002_add_owner_foreign_keys_to_audits_table.php b/database/migrations/2026_10_06_000002_add_owner_foreign_keys_to_audits_table.php
new file mode 100644
index 00000000..7aad0f90
--- /dev/null
+++ b/database/migrations/2026_10_06_000002_add_owner_foreign_keys_to_audits_table.php
@@ -0,0 +1,94 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    /**
+     * PostgreSQL cannot build an index concurrently inside a transaction.
+     * Keeping this migration non-transactional prevents long write locks on the (large) audits table in production.
+     * Every step is idempotent, so the migration can be re-run if it fails halfway.
+     *
+     * @var bool
+     */
+    public $withinTransaction = false;
+
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $this->createIndex('audits_owner_user_id_index', 'owner_user_id');
+        $this->createIndex('audits_owner_organization_id_index', 'owner_organization_id');
+
+        $this->createForeignKey('audits_owner_user_id_foreign', 'owner_user_id', 'users');
+        $this->createForeignKey('audits_owner_organization_id_foreign', 'owner_organization_id', 'organizations');
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        DB::statement('ALTER TABLE audits DROP CONSTRAINT IF EXISTS audits_owner_user_id_foreign');
+        DB::statement('ALTER TABLE audits DROP CONSTRAINT IF EXISTS audits_owner_organization_id_foreign');
+        DB::statement('DROP INDEX'.$this->concurrently().' IF EXISTS audits_owner_user_id_index');
+        DB::statement('DROP INDEX'.$this->concurrently().' IF EXISTS audits_owner_organization_id_index');
+    }
+
+    private function createIndex(string $index, string $column): void
+    {
+        $state = DB::selectOne(
+            <<<'SQL'
+                SELECT pg_index.indisvalid::int AS valid
+                FROM pg_index
+                JOIN pg_class ON pg_class.oid = pg_index.indexrelid
+                JOIN pg_namespace ON pg_namespace.oid = pg_class.relnamespace
+                WHERE pg_namespace.nspname = current_schema()
+                  AND pg_class.relname = ?
+                SQL,
+            [$index],
+        );
+
+        if ($state !== null && (bool) $state->valid) {
+            return;
+        }
+
+        // A failed concurrent index build leaves an invalid index behind, that needs to be dropped before rebuilding
+        if ($state !== null) {
+            DB::statement('DROP INDEX'.$this->concurrently().' '.$index);
+        }
+
+        DB::statement('CREATE INDEX'.$this->concurrently().' '.$index.' ON audits ('.$column.')');
+    }
+
+    private function createForeignKey(string $constraint, string $column, string $referencedTable): void
+    {
+        $exists = DB::selectOne(
+            <<<'SQL'
+                SELECT 1
+                FROM pg_constraint
+                JOIN pg_namespace ON pg_namespace.oid = pg_constraint.connamespace
+                WHERE pg_namespace.nspname = current_schema()
+                  AND pg_constraint.conname = ?
+                SQL,
+            [$constraint],
+        ) !== null;
+
+        // Note: Adding the constraint as NOT VALID only needs a short lock, the validation of the existing rows
+        // afterward does not block reads or writes on the audits table.
+        if (! $exists) {
+            DB::statement('ALTER TABLE audits ADD CONSTRAINT '.$constraint.' FOREIGN KEY ('.$column.') REFERENCES '.$referencedTable.' (id) ON DELETE CASCADE NOT VALID');
+        }
+
+        DB::statement('ALTER TABLE audits VALIDATE CONSTRAINT '.$constraint);
+    }
+
+    private function concurrently(): string
+    {
+        return DB::transactionLevel() === 0 ? ' CONCURRENTLY' : '';
+    }
+};
diff --git a/tests/Unit/Model/AuditModelTest.php b/tests/Unit/Model/AuditModelTest.php
new file mode 100644
index 00000000..bc465c7c
--- /dev/null
+++ b/tests/Unit/Model/AuditModelTest.php
@@ -0,0 +1,122 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Model;
+
+use App\Models\Audit;
+use App\Models\Member;
+use App\Models\Organization;
+use App\Models\Project;
+use App\Models\ProjectMember;
+use App\Models\TimeEntry;
+use App\Models\User;
+use PHPUnit\Framework\Attributes\CoversClass;
+
+#[CoversClass(Audit::class)]
+class AuditModelTest extends ModelTestAbstract
+{
+    public function test_it_belongs_to_an_owner_organization(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $audit = Audit::factory()->create([
+            'owner_organization_id' => $organization->getKey(),
+        ]);
+
+        // Act
+        $audit->refresh();
+        $ownerOrganizationRel = $audit->ownerOrganization;
+
+        // Assert
+        $this->assertNotNull($ownerOrganizationRel);
+        $this->assertTrue($ownerOrganizationRel->is($organization));
+    }
+
+    public function test_it_belongs_to_an_owner_user(): void
+    {
+        // Arrange
+        $user = User::factory()->create();
+        $audit = Audit::factory()->create([
+            'owner_user_id' => $user->getKey(),
+        ]);
+
+        // Act
+        $audit->refresh();
+        $ownerUserRel = $audit->ownerUser;
+
+        // Assert
+        $this->assertNotNull($ownerUserRel);
+        $this->assertTrue($ownerUserRel->is($user));
+    }
+
+    public function test_audits_of_models_with_organization_have_the_organization_as_owner(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $member = Member::factory()->forOrganization($organization)->create();
+
+        // Act
+        $timeEntry = TimeEntry::factory()->forOrganization($organization)->forMember($member)->create();
+
+        // Assert
+        $audit = Audit::query()->where('auditable_id', $timeEntry->getKey())->sole();
+        $this->assertSame($organization->getKey(), $audit->owner_organization_id);
+        $this->assertNull($audit->owner_user_id);
+    }
+
+    public function test_audits_of_project_members_have_the_organization_of_the_project_as_owner(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $project = Project::factory()->forOrganization($organization)->create();
+        $member = Member::factory()->forOrganization($organization)->create();
+
+        // Act
+        $projectMember = ProjectMember::factory()->forProject($project)->forMember($member)->create();
+
+        // Assert
+        $audit = Audit::query()->where('auditable_id', $projectMember->getKey())->sole();
+        $this->assertSame($organization->getKey(), $audit->owner_organization_id);
+        $this->assertNull($audit->owner_user_id);
+    }
+
+    public function test_audits_of_an_organization_have_the_organization_itself_as_owner(): void
+    {
+        // Act
+        $organization = Organization::factory()->create();
+
+        // Assert
+        $audit = Audit::query()->where('auditable_id', $organization->getKey())->sole();
+        $this->assertSame($organization->getKey(), $audit->owner_organization_id);
+        $this->assertNull($audit->owner_user_id);
+    }
+
+    public function test_audits_of_a_user_have_the_user_itself_as_owner(): void
+    {
+        // Act
+        $user = User::factory()->create();
+
+        // Assert
+        $audit = Audit::query()->where('auditable_id', $user->getKey())->sole();
+        $this->assertSame($user->getKey(), $audit->owner_user_id);
+        $this->assertNull($audit->owner_organization_id);
+    }
+
+    public function test_deleting_an_owner_deletes_its_audits_and_does_not_create_a_deletion_audit(): void
+    {
+        // Arrange
+        $user = User::factory()->create();
+        $organization = Organization::factory()->create();
+        $otherUser = User::factory()->create();
+
+        // Act
+        $user->delete();
+        $organization->delete();
+
+        // Assert
+        $this->assertSame(0, Audit::query()->where('auditable_id', $user->getKey())->count());
+        $this->assertSame(0, Audit::query()->where('auditable_id', $organization->getKey())->count());
+        $this->assertSame(1, Audit::query()->where('auditable_id', $otherUser->getKey())->count());
+    }
+}
diff --git a/tests/Unit/Service/DeletionServiceTest.php b/tests/Unit/Service/DeletionServiceTest.php
index 30b4ccc9..ad767abb 100644
--- a/tests/Unit/Service/DeletionServiceTest.php
+++ b/tests/Unit/Service/DeletionServiceTest.php
@@ -7,6 +7,7 @@ namespace Tests\Unit\Service;
 use App\Enums\Role;
 use App\Events\BeforeOrganizationDeletion;
 use App\Exceptions\Api\CanNotDeleteUserWhoIsOwnerOfOrganizationWithMultipleMembers;
+use App\Models\Audit;
 use App\Models\Client;
 use App\Models\Member;
 use App\Models\Organization;
@@ -182,6 +183,8 @@ class DeletionServiceTest extends TestCaseWithDatabase
         // Assert
         $this->assertOrganizationDeleted($organization->organization);
         $this->assertOrganizationNothingDeleted($otherOrganization->organization);
+        $this->assertSame(0, Audit::query()->where('owner_organization_id', $organization->organization->getKey())->count());
+        $this->assertGreaterThan(0, Audit::query()->where('owner_organization_id', $otherOrganization->organization->getKey())->count());
         Log::assertLoggedTimes(fn (LogEntry $log) => $log->level === 'debug'
             && $log->message === 'Start deleting organization'
             && $log->context['organization_id'] === $organization->organization->getKey(),
@@ -318,6 +321,10 @@ class DeletionServiceTest extends TestCaseWithDatabase
         $this->assertDatabaseMissing(Member::class, [
             'user_id' => $user->getKey(),
         ]);
+        $this->assertSame(0, Audit::query()->where('owner_user_id', $user->getKey())->count());
+        $this->assertSame(0, Audit::query()->where('owner_organization_id', $user->current_team_id)->count());
+        $this->assertGreaterThan(0, Audit::query()->where('owner_user_id', $otherUser->getKey())->count());
+        $this->assertGreaterThan(0, Audit::query()->where('owner_organization_id', $otherUser->current_team_id)->count());
         Storage::disk(config('filesystems.public'))->assertMissing($user->profile_photo_path);
         Storage::disk(config('filesystems.public'))->assertExists($otherUser->profile_photo_path);
         Log::assertLoggedTimes(fn (LogEntry $log) => $log->level === 'debug'
@@ -332,6 +339,24 @@ class DeletionServiceTest extends TestCaseWithDatabase
         );
     }
 
+    public function test_delete_user_keeps_audits_of_other_organizations_where_the_user_is_the_actor(): void
+    {
+        // Arrange
+        $user = User::factory()->withPersonalOrganization()->create();
+        $otherOrganization = Organization::factory()->create();
+        $audit = Audit::factory()->auditUser($user)->auditFor($otherOrganization)->create([
+            'owner_organization_id' => $otherOrganization->getKey(),
+        ]);
+
+        // Act
+        $this->deletionService->deleteUser($user);
+
+        // Assert
+        $audit->refresh();
+        $this->assertSame($user->getKey(), $audit->actor_id);
+        $this->assertSame($otherOrganization->getKey(), $audit->owner_organization_id);
+    }
+
     public function test_delete_user_deletes_owned_organizations_that_have_only_one_member_and_makes_makes_the_user_placeholder_in_not_owned_organizations(): void
     {
         // Arrange