diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 247a140223d..dcb05293b0d 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -649,6 +649,7 @@ return array(
     'OCP\\IUserManager' => $baseDir . '/lib/public/IUserManager.php',
     'OCP\\IUserSession' => $baseDir . '/lib/public/IUserSession.php',
     'OCP\\Image' => $baseDir . '/lib/public/Image.php',
+    'OCP\\Install\\Events\\InstallationCompletedEvent' => $baseDir . '/lib/public/Install/Events/InstallationCompletedEvent.php',
     'OCP\\L10N\\IFactory' => $baseDir . '/lib/public/L10N/IFactory.php',
     'OCP\\L10N\\ILanguageIterator' => $baseDir . '/lib/public/L10N/ILanguageIterator.php',
     'OCP\\LDAP\\IDeletionFlagSupport' => $baseDir . '/lib/public/LDAP/IDeletionFlagSupport.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index 9f3d6c2c3dd..34e3bcced48 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -690,6 +690,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\IUserManager' => __DIR__ . '/../../..' . '/lib/public/IUserManager.php',
         'OCP\\IUserSession' => __DIR__ . '/../../..' . '/lib/public/IUserSession.php',
         'OCP\\Image' => __DIR__ . '/../../..' . '/lib/public/Image.php',
+        'OCP\\Install\\Events\\InstallationCompletedEvent' => __DIR__ . '/../../..' . '/lib/public/Install/Events/InstallationCompletedEvent.php',
         'OCP\\L10N\\IFactory' => __DIR__ . '/../../..' . '/lib/public/L10N/IFactory.php',
         'OCP\\L10N\\ILanguageIterator' => __DIR__ . '/../../..' . '/lib/public/L10N/ILanguageIterator.php',
         'OCP\\LDAP\\IDeletionFlagSupport' => __DIR__ . '/../../..' . '/lib/public/LDAP/IDeletionFlagSupport.php',
diff --git a/lib/private/Setup.php b/lib/private/Setup.php
index 5f91dc10692..24fe3df4096 100644
--- a/lib/private/Setup.php
+++ b/lib/private/Setup.php
@@ -23,12 +23,14 @@ use OC\User\BackgroundJobs\CleanupDeletedUsers;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\BackgroundJob\IJobList;
 use OCP\Defaults;
+use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Http\Client\IClientService;
 use OCP\IAppConfig;
 use OCP\IConfig;
 use OCP\IGroup;
 use OCP\IGroupManager;
 use OCP\IL10N;
+use OCP\Install\Events\InstallationCompletedEvent;
 use OCP\IRequest;
 use OCP\IURLGenerator;
 use OCP\IUserManager;
@@ -51,6 +53,7 @@ class Setup {
 		protected LoggerInterface $logger,
 		protected ISecureRandom $random,
 		protected Installer $installer,
+		protected IEventDispatcher $eventDispatcher,
 	) {
 		$this->l10n = $l10nFactory->get('lib');
 	}
@@ -495,6 +498,13 @@ class Setup {
 			}
 		}
 
+		// Dispatch installation completed event
+		$adminUsername = !$disableAdminUser ? ($options['adminlogin'] ?? null) : null;
+		$adminEmail = !empty($options['adminemail']) ? $options['adminemail'] : null;
+		$this->eventDispatcher->dispatchTyped(
+			new InstallationCompletedEvent($dataDir, $adminUsername, $adminEmail)
+		);
+
 		return $error;
 	}
 
diff --git a/tests/lib/SetupTest.php b/tests/lib/SetupTest.php
index 0be7eab36f6..1a48803ecd6 100644
--- a/tests/lib/SetupTest.php
+++ b/tests/lib/SetupTest.php
@@ -13,6 +13,7 @@ use OC\Installer;
 use OC\Setup;
 use OC\SystemConfig;
 use OCP\Defaults;
+use OCP\EventDispatcher\IEventDispatcher;
 use OCP\IL10N;
 use OCP\L10N\IFactory as IL10NFactory;
 use OCP\Security\ISecureRandom;
@@ -28,6 +29,7 @@ class SetupTest extends \Test\TestCase {
 	protected LoggerInterface $logger;
 	protected ISecureRandom $random;
 	protected Installer $installer;
+	protected IEventDispatcher $eventDispatcher;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -42,9 +44,10 @@ class SetupTest extends \Test\TestCase {
 		$this->logger = $this->createMock(LoggerInterface::class);
 		$this->random = $this->createMock(ISecureRandom::class);
 		$this->installer = $this->createMock(Installer::class);
+		$this->eventDispatcher = $this->createMock(IEventDispatcher::class);
 		$this->setupClass = $this->getMockBuilder(Setup::class)
 			->onlyMethods(['class_exists', 'is_callable', 'getAvailableDbDriversForPdo'])
-			->setConstructorArgs([$this->config, $this->iniWrapper, $this->l10nFactory, $this->defaults, $this->logger, $this->random, $this->installer])
+			->setConstructorArgs([$this->config, $this->iniWrapper, $this->l10nFactory, $this->defaults, $this->logger, $this->random, $this->installer, $this->eventDispatcher])
 			->getMock();
 	}