diff --git a/lib/private/User/Manager.php b/lib/private/User/Manager.php
index 6aa9784e2bd..4e7664420d4 100644
--- a/lib/private/User/Manager.php
+++ b/lib/private/User/Manager.php
@@ -19,6 +19,7 @@ use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\IGroup;
 use OCP\IRequest;
+use OCP\IURLGenerator;
 use OCP\IUser;
 use OCP\IUserBackend;
 use OCP\IUserManager;
@@ -37,6 +38,7 @@ use OCP\User\Events\UserCreatedEvent;
 use OCP\UserInterface;
 use OCP\Util;
 use Psr\Log\LoggerInterface;
+use RuntimeException;
 
 /**
  * Class Manager
@@ -70,6 +72,9 @@ class Manager extends PublicEmitter implements IUserManager {
 
 	private DisplayNameCache $displayNameCache;
 
+	// IURLGenerator can't be injected through DI
+	private ?IURLGenerator $urlGenerator;
+
 	// This constructor can't autoload any class requiring a DB connection.
 	public function __construct(
 		private IConfig $config,
@@ -862,4 +867,25 @@ class Manager extends PublicEmitter implements IUserManager {
 	public function getExistingUser(string $userId, ?string $displayName = null): IUser {
 		return new LazyUser($userId, $this, $displayName);
 	}
+
+
+	#[\Override]
+	public function getAvatarUrlLight(string $userId, int $size): string {
+		$url = ($this->urlGenerator ??= Server::get(IURLGenerator::class))->linkToRouteAbsolute('core.avatar.getAvatar', ['userId' => $userId, 'size' => $size]);
+		if ($url === '') {
+			throw new RuntimeException('The URL is empty.');
+		}
+
+		return $url;
+	}
+
+	#[\Override]
+	public function getAvatarUrlDark(string $userId, int $size): string {
+		$url = ($this->urlGenerator ??= Server::get(IURLGenerator::class))->linkToRouteAbsolute('core.avatar.getAvatarDark', ['userId' => $userId, 'size' => $size]);
+		if ($url === '') {
+			throw new RuntimeException('The URL is empty.');
+		}
+
+		return $url;
+	}
 }
diff --git a/lib/public/IUserManager.php b/lib/public/IUserManager.php
index 4d4006282aa..f19685903ba 100644
--- a/lib/public/IUserManager.php
+++ b/lib/public/IUserManager.php
@@ -266,4 +266,19 @@ interface IUserManager {
 	 * @since 33.0.0
 	 */
 	public function getExistingUser(string $userId, ?string $displayName = null): IUser;
+
+
+	/**
+	 * @param 64|512 $size
+	 * @return non-empty-string
+	 * @since 34.0.0
+	 */
+	public function getAvatarUrlLight(string $userId, int $size): string;
+
+	/**
+	 * @param 64|512 $size
+	 * @return non-empty-string
+	 * @since 34.0.0
+	 */
+	public function getAvatarUrlDark(string $userId, int $size): string;
 }
diff --git a/tests/lib/User/ManagerTest.php b/tests/lib/User/ManagerTest.php
index 65166836d34..acb35bf7cf7 100644
--- a/tests/lib/User/ManagerTest.php
+++ b/tests/lib/User/ManagerTest.php
@@ -733,4 +733,12 @@ class ManagerTest extends TestCase {
 		$this->assertEquals('nobody', $user->getUID());
 		$this->assertEquals('None', $user->getDisplayName());
 	}
+
+	public function testGetAvatarUrlLight(): void {
+		$this->assertEquals('http://localhost/index.php/avatar/userid/64', $this->manager->getAvatarUrlLight('userid', 64));
+	}
+
+	public function testGetAvatarUrlDark(): void {
+		$this->assertEquals('http://localhost/index.php/avatar/userid/64/dark', $this->manager->getAvatarUrlDark('userid', 64));
+	}
 }