diff --git a/config/app.php b/config/app.php
index 3cd08e40..6449154a 100644
--- a/config/app.php
+++ b/config/app.php
@@ -37,6 +37,7 @@ return [
         \Engelsystem\Http\HttpClientServiceProvider::class,
         \Engelsystem\Helpers\DumpServerServiceProvider::class,
         \Engelsystem\Helpers\UuidServiceProvider::class,
+        \Engelsystem\Controllers\Api\UsesAuthServiceProvider::class,
     ],
 
     // Application middleware
diff --git a/config/routes.php b/config/routes.php
index ec0c558f..972163c6 100644
--- a/config/routes.php
+++ b/config/routes.php
@@ -130,9 +130,9 @@ $route->addGroup(
 
                 $route->get('/news', 'Api\NewsController@index');
 
-                $route->get('/users/self', 'Api\UsersController@self');
-                $route->get('/users/{user_id:\d+}/angeltypes', 'Api\AngelTypeController@ofUser');
-                $route->get('/users/{user_id:\d+}/shifts', 'Api\ShiftsController@entriesByUser');
+                $route->get('/users/{user_id:(?:\d+|self)}', 'Api\UsersController@user');
+                $route->get('/users/{user_id:(?:\d+|self)}/angeltypes', 'Api\AngelTypeController@ofUser');
+                $route->get('/users/{user_id:(?:\d+|self)}/shifts', 'Api\ShiftsController@entriesByUser');
 
                 $route->addRoute(
                     ['POST', 'PUT', 'DELETE', 'PATCH'],
diff --git a/resources/api/openapi.yml b/resources/api/openapi.yml
index 70b21dc3..32935d56 100644
--- a/resources/api/openapi.yml
+++ b/resources/api/openapi.yml
@@ -505,7 +505,17 @@ paths:
         '404':
           $ref: '#/components/responses/NotFoundError'
 
-  /users/self:
+  /users/{id}:
+    parameters:
+      - name: id
+        in: path
+        required: true
+        description: The user identifier or `self`
+        example: 42
+        schema:
+          oneOf:
+            - type: string
+            - type: integer
     get:
       tags:
         - user
@@ -519,7 +529,9 @@ paths:
                 type: object
                 properties:
                   data:
-                    $ref: '#/components/schemas/UserDetail'
+                    anyOf:
+                      - $ref: '#/components/schemas/UserDetail'
+                      - $ref: '#/components/schemas/User'
         '401':
           $ref: '#/components/responses/UnauthorizedError'
         '403':
@@ -532,10 +544,12 @@ paths:
       - name: id
         in: path
         required: true
-        description: The user identifier
+        description: The user identifier or `self`
         example: 42
         schema:
-          type: integer
+          oneOf:
+            - type: string
+            - type: integer
     get:
       tags:
         - angeltype
@@ -565,10 +579,12 @@ paths:
       - name: id
         in: path
         required: true
-        description: The user identifier
+        description: The user identifier or `self`
         example: 42
         schema:
-          type: integer
+          oneOf:
+            - type: string
+            - type: integer
     get:
       tags:
         - shift
diff --git a/src/Controllers/Api/AngelTypeController.php b/src/Controllers/Api/AngelTypeController.php
index ed774770..296cf3c8 100644
--- a/src/Controllers/Api/AngelTypeController.php
+++ b/src/Controllers/Api/AngelTypeController.php
@@ -9,10 +9,11 @@ use Engelsystem\Controllers\Api\Resources\UserAngelTypeResource;
 use Engelsystem\Http\Request;
 use Engelsystem\Http\Response;
 use Engelsystem\Models\AngelType;
-use Engelsystem\Models\User\User;
 
 class AngelTypeController extends ApiController
 {
+    use UsesAuth;
+
     public function index(): Response
     {
         $models = AngelType::query()
@@ -26,9 +27,10 @@ class AngelTypeController extends ApiController
 
     public function ofUser(Request $request): Response
     {
-        $id = (int) $request->getAttribute('user_id');
-        $model = User::findOrFail($id);
-        $data = ['data' => UserAngelTypeResource::collection($model->userAngelTypes)];
+        $id = $request->getAttribute('user_id');
+        $user = $this->getUser($id);
+
+        $data = ['data' => UserAngelTypeResource::collection($user->userAngelTypes)];
 
         return $this->response
             ->withContent(json_encode($data));
diff --git a/src/Controllers/Api/ShiftsController.php b/src/Controllers/Api/ShiftsController.php
index 854d38c9..e30d4d36 100644
--- a/src/Controllers/Api/ShiftsController.php
+++ b/src/Controllers/Api/ShiftsController.php
@@ -15,11 +15,12 @@ use Engelsystem\Models\Location;
 use Engelsystem\Models\Shifts\NeededAngelType;
 use Engelsystem\Models\Shifts\Shift;
 use Engelsystem\Models\Shifts\ShiftEntry;
-use Engelsystem\Models\User\User;
 use Illuminate\Database\Eloquent\Collection;
 
 class ShiftsController extends ApiController
 {
+    use UsesAuth;
+
     public function entriesByAngeltype(Request $request): Response
     {
         $id = (int) $request->getAttribute('angeltype_id');
@@ -72,9 +73,9 @@ class ShiftsController extends ApiController
 
     public function entriesByUser(Request $request): Response
     {
-        $id = (int) $request->getAttribute('user_id');
-        /** @var User $user */
-        $user = User::findOrFail($id);
+        $id = $request->getAttribute('user_id');
+        $user = $this->getUser($id);
+
         /** @var ShiftEntry[]|Collection $shifts */
         $shiftEntries = $user->shiftEntries()
             ->with([
diff --git a/src/Controllers/Api/UsersController.php b/src/Controllers/Api/UsersController.php
index eeb1e26c..5173a128 100644
--- a/src/Controllers/Api/UsersController.php
+++ b/src/Controllers/Api/UsersController.php
@@ -5,21 +5,21 @@ declare(strict_types=1);
 namespace Engelsystem\Controllers\Api;
 
 use Engelsystem\Controllers\Api\Resources\UserDetailResource;
-use Engelsystem\Helpers\Authenticator;
+use Engelsystem\Controllers\Api\Resources\UserResource;
+use Engelsystem\Http\Request;
 use Engelsystem\Http\Response;
 
 class UsersController extends ApiController
 {
-    public function __construct(Response $response, protected Authenticator $auth)
-    {
-        parent::__construct($response);
-    }
+    use UsesAuth;
 
-    public function self(): Response
+    public function user(Request $request): Response
     {
-        $user = $this->auth->user();
+        $id = $request->getAttribute('user_id');
+        $user = $this->getUser($id);
 
-        $data = ['data' => (new UserDetailResource($user))->toArray()];
+        $userData = $user->id == $this->auth->user()->id ? new UserDetailResource($user) : new UserResource($user);
+        $data = ['data' => $userData->toArray()];
         return $this->response
             ->withContent(json_encode($data));
     }
diff --git a/src/Controllers/Api/UsesAuth.php b/src/Controllers/Api/UsesAuth.php
new file mode 100644
index 00000000..cefaaeb9
--- /dev/null
+++ b/src/Controllers/Api/UsesAuth.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Engelsystem\Controllers\Api;
+
+use Engelsystem\Helpers\Authenticator;
+use Engelsystem\Models\User\User;
+
+trait UsesAuth
+{
+    protected ?Authenticator $auth = null;
+
+    public function setAuth(Authenticator $auth): void
+    {
+        $this->auth = $auth;
+    }
+
+    protected function getUser(int|string $userId): ?User
+    {
+        if ($userId == 'self' && $this->auth) {
+            return $this->auth->user();
+        }
+
+        return User::findOrFail($userId);
+    }
+}
diff --git a/src/Controllers/Api/UsesAuthServiceProvider.php b/src/Controllers/Api/UsesAuthServiceProvider.php
new file mode 100644
index 00000000..e0787350
--- /dev/null
+++ b/src/Controllers/Api/UsesAuthServiceProvider.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Engelsystem\Controllers\Api;
+
+use Engelsystem\Application;
+use Engelsystem\Container\ServiceProvider;
+use Engelsystem\Helpers\Authenticator;
+
+class UsesAuthServiceProvider extends ServiceProvider
+{
+    public function register(): void
+    {
+        $this->app->afterResolving(function ($object, Application $app): void {
+            if (!$object instanceof ApiController || !method_exists($object, 'setAuth')) {
+                return;
+            }
+
+            /** @var UsesAuth $object */
+            $object->setAuth($app->get(Authenticator::class));
+        });
+    }
+}
diff --git a/tests/Unit/Controllers/Api/AngelTypeControllerTest.php b/tests/Unit/Controllers/Api/AngelTypeControllerTest.php
index dc161508..a4e7f63d 100644
--- a/tests/Unit/Controllers/Api/AngelTypeControllerTest.php
+++ b/tests/Unit/Controllers/Api/AngelTypeControllerTest.php
@@ -5,11 +5,13 @@ declare(strict_types=1);
 namespace Engelsystem\Test\Unit\Controllers\Api;
 
 use Engelsystem\Controllers\Api\AngelTypeController;
+use Engelsystem\Helpers\Authenticator;
 use Engelsystem\Http\Request;
 use Engelsystem\Http\Response;
 use Engelsystem\Models\AngelType;
 use Engelsystem\Models\User\User;
 use Engelsystem\Models\UserAngelType;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
 
 class AngelTypeControllerTest extends ApiBaseControllerTest
 {
@@ -18,7 +20,6 @@ class AngelTypeControllerTest extends ApiBaseControllerTest
      */
     public function testIndex(): void
     {
-        $this->initDatabase();
         $items = AngelType::factory(3)->create();
 
         $controller = new AngelTypeController(new Response());
@@ -42,7 +43,6 @@ class AngelTypeControllerTest extends ApiBaseControllerTest
      */
     public function testOfUser(): void
     {
-        $this->initDatabase();
         $user = User::factory()->create();
         $items = UserAngelType::factory(3)->create(['user_id' => $user->id]);
 
@@ -61,4 +61,38 @@ class AngelTypeControllerTest extends ApiBaseControllerTest
             return $item['name'] == $items->first()->angelType->name;
         }));
     }
+
+    /**
+     * @covers \Engelsystem\Controllers\Api\AngelTypeController::ofUser
+     */
+    public function testEntriesOfUserSelf(): void
+    {
+        $user = User::factory()->create();
+
+        $auth = $this->createMock(Authenticator::class);
+        $this->setExpects($auth, 'user', null, $user);
+
+        $request = new Request();
+        $request = $request->withAttribute('user_id', 'self');
+
+        $controller = new AngelTypeController(new Response());
+        $controller->setAuth($auth);
+
+        $response = $controller->ofUser($request);
+        $this->validateApiResponse('/users/{id}/angeltypes', 'get', $response);
+    }
+
+    /**
+     * @covers \Engelsystem\Controllers\Api\AngelTypeController::ofUser
+     */
+    public function testEntriesByUserNotFound(): void
+    {
+        $request = new Request();
+        $request = $request->withAttribute('user_id', 42);
+
+        $controller = new AngelTypeController(new Response());
+
+        $this->expectException(ModelNotFoundException::class);
+        $controller->ofUser($request);
+    }
 }
diff --git a/tests/Unit/Controllers/Api/ShiftsControllerTest.php b/tests/Unit/Controllers/Api/ShiftsControllerTest.php
index 9c098930..ac5e40d7 100644
--- a/tests/Unit/Controllers/Api/ShiftsControllerTest.php
+++ b/tests/Unit/Controllers/Api/ShiftsControllerTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace Engelsystem\Test\Unit\Controllers\Api;
 
 use Engelsystem\Controllers\Api\ShiftsController;
+use Engelsystem\Helpers\Authenticator;
 use Engelsystem\Helpers\Carbon;
 use Engelsystem\Http\Request;
 use Engelsystem\Http\Response;
@@ -17,6 +18,7 @@ use Engelsystem\Models\Shifts\ShiftEntry;
 use Engelsystem\Models\User\Contact;
 use Engelsystem\Models\User\PersonalData;
 use Engelsystem\Models\User\User;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
 
 class ShiftsControllerTest extends ApiBaseControllerTest
 {
@@ -133,6 +135,40 @@ class ShiftsControllerTest extends ApiBaseControllerTest
         $this->assertTrue(count($shift['entries']) >= 1);
     }
 
+    /**
+     * @covers \Engelsystem\Controllers\Api\ShiftsController::entriesByUser
+     */
+    public function testEntriesByUserSelf(): void
+    {
+        $user = User::query()->first();
+
+        $auth = $this->createMock(Authenticator::class);
+        $this->setExpects($auth, 'user', null, $user);
+
+        $request = new Request();
+        $request = $request->withAttribute('user_id', 'self');
+
+        $controller = new ShiftsController(new Response());
+        $controller->setAuth($auth);
+
+        $response = $controller->entriesByUser($request);
+        $this->validateApiResponse('/users/{id}/shifts', 'get', $response);
+    }
+
+    /**
+     * @covers \Engelsystem\Controllers\Api\ShiftsController::entriesByUser
+     */
+    public function testEntriesByUserNotFound(): void
+    {
+        $request = new Request();
+        $request = $request->withAttribute('user_id', 42);
+
+        $controller = new ShiftsController(new Response());
+
+        $this->expectException(ModelNotFoundException::class);
+        $controller->entriesByUser($request);
+    }
+
     public function setUp(): void
     {
         parent::setUp();
diff --git a/tests/Unit/Controllers/Api/Stub/UsesAuthImplementation.php b/tests/Unit/Controllers/Api/Stub/UsesAuthImplementation.php
new file mode 100644
index 00000000..75557847
--- /dev/null
+++ b/tests/Unit/Controllers/Api/Stub/UsesAuthImplementation.php
@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Engelsystem\Test\Unit\Controllers\Api\Stub;
+
+use Engelsystem\Controllers\Api\ApiController;
+use Engelsystem\Controllers\Api\UsesAuth;
+use Engelsystem\Models\User\User;
+
+class UsesAuthImplementation extends ApiController
+{
+    use UsesAuth;
+
+    public function user(string|int $id): ?User
+    {
+        return $this->getUser($id);
+    }
+}
diff --git a/tests/Unit/Controllers/Api/UsersControllerTest.php b/tests/Unit/Controllers/Api/UsersControllerTest.php
index 0f99299e..65371ed5 100644
--- a/tests/Unit/Controllers/Api/UsersControllerTest.php
+++ b/tests/Unit/Controllers/Api/UsersControllerTest.php
@@ -6,6 +6,7 @@ namespace Engelsystem\Test\Unit\Controllers\Api;
 
 use Engelsystem\Controllers\Api\UsersController;
 use Engelsystem\Helpers\Authenticator;
+use Engelsystem\Http\Request;
 use Engelsystem\Http\Response;
 use Engelsystem\Models\User\Contact;
 use Engelsystem\Models\User\PersonalData;
@@ -17,11 +18,10 @@ use PHPUnit\Framework\MockObject\MockObject;
 class UsersControllerTest extends ApiBaseControllerTest
 {
     /**
-     * @covers \Engelsystem\Controllers\Api\UsersController::__construct
-     * @covers \Engelsystem\Controllers\Api\UsersController::self
+     * @covers \Engelsystem\Controllers\Api\UsersController::user
      * @covers \Engelsystem\Controllers\Api\Resources\UserDetailResource::toArray
      */
-    public function testSelf(): void
+    public function testUser(): void
     {
         $user = User::factory()
             ->has(Contact::factory())
@@ -32,12 +32,16 @@ class UsersControllerTest extends ApiBaseControllerTest
 
         /** @var Authenticator|MockObject $auth */
         $auth = $this->createMock(Authenticator::class);
-        $this->setExpects($auth, 'user', null, $user);
+        $this->setExpects($auth, 'user', null, $user, $this->atLeastOnce());
 
-        $controller = new UsersController(new Response(), $auth);
+        $request = new Request();
+        $request = $request->withAttribute('user_id', 'self');
 
-        $response = $controller->self();
-        $this->validateApiResponse('/users/self', 'get', $response);
+        $controller = new UsersController(new Response());
+        $controller->setAuth($auth);
+
+        $response = $controller->user($request);
+        $this->validateApiResponse('/users/{id}', 'get', $response);
 
         $this->assertEquals(['application/json'], $response->getHeader('content-type'));
         $this->assertJson($response->getContent());
@@ -48,4 +52,36 @@ class UsersControllerTest extends ApiBaseControllerTest
         $this->assertEquals($user->id, $data['data']['id']);
         $this->assertArrayHasKey('dates', $data['data']);
     }
+
+    /**
+     * @covers \Engelsystem\Controllers\Api\UsersController::user
+     */
+    public function testUserById(): void
+    {
+        $user = User::factory()->create();
+        $otherUser = User::factory()
+            ->has(Contact::factory())
+            ->has(PersonalData::factory())
+            ->has(Settings::factory())
+            ->has(State::factory())
+            ->create();
+
+        /** @var Authenticator|MockObject $auth */
+        $auth = $this->createMock(Authenticator::class);
+        $this->setExpects($auth, 'user', null, $user, $this->atLeastOnce());
+
+        $request = new Request();
+        $request = $request->withAttribute('user_id', $otherUser->id);
+
+        $controller = new UsersController(new Response());
+        $controller->setAuth($auth);
+
+        $response = $controller->user($request);
+        $this->validateApiResponse('/users/{id}', 'get', $response);
+
+        $data = json_decode($response->getContent(), true);
+        $this->assertArrayHasKey('id', $data['data']);
+        $this->assertEquals($otherUser->id, $data['data']['id']);
+        $this->assertArrayNotHasKey('dates', $data['data']);
+    }
 }
diff --git a/tests/Unit/Controllers/Api/UsesAuthServiceProviderTest.php b/tests/Unit/Controllers/Api/UsesAuthServiceProviderTest.php
new file mode 100644
index 00000000..0e24aa37
--- /dev/null
+++ b/tests/Unit/Controllers/Api/UsesAuthServiceProviderTest.php
@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Engelsystem\Test\Unit\Controllers\Api;
+
+use Engelsystem\Controllers\Api\UsesAuthServiceProvider;
+use Engelsystem\Helpers\Authenticator;
+use Engelsystem\Models\User\User;
+use Engelsystem\Test\Unit\Controllers\Api\Stub\UsesAuthImplementation;
+use Engelsystem\Test\Unit\TestCase;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class UsesAuthServiceProviderTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Controllers\Api\UsesAuthServiceProvider::register
+     */
+    public function testRegister(): void
+    {
+        $serviceProvider = new UsesAuthServiceProvider($this->app);
+        $serviceProvider->register();
+
+        $user = new User();
+
+        /** @var Authenticator|MockObject $auth */
+        $auth = $this->createMock(Authenticator::class);
+        $this->setExpects($auth, 'user', null, $user);
+        $this->app->instance(Authenticator::class, $auth);
+
+        /** @var UsesAuthImplementation $instance */
+        $instance = $this->app->make(UsesAuthImplementation::class);
+
+        $this->assertEquals($user, $instance->user('self'));
+    }
+}
diff --git a/tests/Unit/Controllers/Api/UsesAuthTest.php b/tests/Unit/Controllers/Api/UsesAuthTest.php
new file mode 100644
index 00000000..2ba4830f
--- /dev/null
+++ b/tests/Unit/Controllers/Api/UsesAuthTest.php
@@ -0,0 +1,72 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Engelsystem\Test\Unit\Controllers\Api;
+
+use Engelsystem\Helpers\Authenticator;
+use Engelsystem\Http\Response;
+use Engelsystem\Models\User\User;
+use Engelsystem\Test\Unit\Controllers\Api\Stub\UsesAuthImplementation;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class UsesAuthTest extends ApiBaseControllerTest
+{
+    /**
+     * @covers \Engelsystem\Controllers\Api\UsesAuth::getUser
+     */
+    public function testGetUserNoAuthNotFound(): void
+    {
+        $usesAuth = $this->createInstance();
+
+        $this->expectException(ModelNotFoundException::class);
+        $usesAuth->user('self');
+    }
+
+    /**
+     * @covers \Engelsystem\Controllers\Api\UsesAuth::getUser
+     */
+    public function testGetUserNotFound(): void
+    {
+        $usesAuth = $this->createInstance();
+
+        $this->expectException(ModelNotFoundException::class);
+        $usesAuth->user(42);
+    }
+
+    /**
+     * @covers \Engelsystem\Controllers\Api\UsesAuth::getUser
+     */
+    public function testGetUserWithoutAuth(): void
+    {
+        $user = User::factory()->create();
+
+        $usesAuth = $this->createInstance();
+
+        $this->assertInstanceOf(User::class, $usesAuth->user($user->id));
+    }
+
+    /**
+     * @covers \Engelsystem\Controllers\Api\UsesAuth::setAuth
+     * @covers \Engelsystem\Controllers\Api\UsesAuth::getUser
+     */
+    public function testGetUser(): void
+    {
+        $user = User::factory()->create();
+
+        /** @var Authenticator|MockObject $auth */
+        $auth = $this->createMock(Authenticator::class);
+        $this->setExpects($auth, 'user', null, $user);
+
+        $usesAuth = $this->createInstance();
+        $usesAuth->setAuth($auth);
+
+        $this->assertEquals($user, $usesAuth->user('self'));
+    }
+
+    protected function createInstance(): object
+    {
+        return new UsesAuthImplementation(new Response());
+    }
+}