diff --git a/app/Member/Data/NestedGroup.php b/app/Member/Data/NestedGroup.php
new file mode 100644
index 00000000..68007842
--- /dev/null
+++ b/app/Member/Data/NestedGroup.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Member\Data;
+
+use App\Group;
+use Illuminate\Support\Collection;
+use Spatie\LaravelData\Data;
+use Spatie\LaravelData\DataCollection;
+
+class NestedGroup extends Data
+{
+    public function __construct(
+        public int $id,
+        public string $name,
+    ) {
+    }
+
+    /**
+     * @return Collection<int, array{name: string, id: int}>
+     */
+    public static function forSelect(?int $parentId = null, int $level = 0): Collection
+    {
+        $groups = collect([]);
+
+        foreach (Group::where('parent_id', $parentId)->orderBy('name')->get()->toBase() as $group) {
+            $groups->push(['name' => str_repeat('- ', $level).$group->name, 'id' => $group->id]);
+            $groups = $groups->merge(static::forSelect($group->id, $level + 1));
+        }
+
+        return $groups;
+    }
+
+    /**
+     * @return DataCollection<int, static>
+     */
+    public static function cacheForSelect(): DataCollection
+    {
+        return static::collection(static::forSelect());
+    }
+}
diff --git a/app/Member/FilterScope.php b/app/Member/FilterScope.php
index 6ca8ea5f..546b5394 100644
--- a/app/Member/FilterScope.php
+++ b/app/Member/FilterScope.php
@@ -22,6 +22,7 @@ class FilterScope extends Filter
         public ?int $activityId = null,
         public ?int $subactivityId = null,
         public string $search = '',
+        public ?int $groupId = null,
     ) {
     }
 
@@ -47,6 +48,11 @@ class FilterScope extends Filter
         if ($this->billKind) {
             $query->where('bill_kind', BillKind::fromValue($this->billKind));
         }
+
+        if ($this->groupId) {
+            $query->where('group_id', $this->groupId);
+        }
+
         if ($this->subactivityId || $this->activityId) {
             $query->whereHas('memberships', function ($q) {
                 $q->active();
diff --git a/app/Member/MemberResource.php b/app/Member/MemberResource.php
index f80c00cf..fda33d14 100644
--- a/app/Member/MemberResource.php
+++ b/app/Member/MemberResource.php
@@ -3,8 +3,8 @@
 namespace App\Member;
 
 use App\Course\Resources\CourseMemberResource;
-use App\Group;
 use App\Lib\HasMeta;
+use App\Member\Data\NestedGroup;
 use App\Member\Resources\NationalityResource;
 use App\Member\Resources\RegionResource;
 use App\Membership\MembershipResource;
@@ -104,7 +104,7 @@ class MemberResource extends JsonResource
     public static function meta(): array
     {
         return [
-            'groups' => Group::select('name', 'id')->get(),
+            'groups' => NestedGroup::cacheForSelect(),
             'filter' => FilterScope::fromRequest(request()->input('filter', '')),
         ];
     }
diff --git a/resources/js/views/member/VIndex.vue b/resources/js/views/member/VIndex.vue
index c234689f..bbc321a2 100644
--- a/resources/js/views/member/VIndex.vue
+++ b/resources/js/views/member/VIndex.vue
@@ -3,6 +3,7 @@
         <div class="px-6 py-2 flex border-b border-gray-600 items-center space-x-3">
             <f-text :value="getFilter('search')" @input="setFilter('search', $event)" id="search" name="search" label="Suchen …" size="sm"></f-text>
             <f-switch v-show="hasModule('bill')" id="ausstand" @input="setFilter('ausstand', $event)" :items="getFilter('ausstand')" label="Nur Ausstände" size="sm"></f-switch>
+            <f-select id="group_id" @input="setFilter('group_id', $event)" :options="data.meta.groups" :value="getFilter('group_id')" label="Gruppierung" size="sm" name="group_id"></f-select>
             <f-select
                 v-show="hasModule('bill')"
                 name="billKinds"
diff --git a/tests/Feature/Member/IndexTest.php b/tests/Feature/Member/IndexTest.php
index 7fd518bb..5d917e1e 100644
--- a/tests/Feature/Member/IndexTest.php
+++ b/tests/Feature/Member/IndexTest.php
@@ -184,6 +184,23 @@ class IndexTest extends TestCase
         $this->assertInertiaHas('E-Mail', $emailResponse, 'data.meta.filter.bill_kind');
     }
 
+    public function testItCanFilterForGroups(): void
+    {
+        $this->withoutExceptionHandling()->login()->loginNami();
+        $group1 = Group::factory()->create();
+        $group2 = Group::factory()->create();
+        Member::factory()->defaults()->for($group1)->create();
+        Member::factory()->defaults()->for($group1)->create();
+        Member::factory()->defaults()->for($group1)->create();
+
+        $oneResponse = $this->callFilter('member.index', ['group_id' => $group1->id]);
+        $twoResponse = $this->callFilter('member.index', ['group_id' => $group2->id]);
+
+        $this->assertCount(3, $this->inertia($oneResponse, 'data.data'));
+        $this->assertCount(0, $this->inertia($twoResponse, 'data.data'));
+        $this->assertInertiaHas($group1->id, $oneResponse, 'data.meta.filter.group_id');
+    }
+
     public function testItFiltersForAusstand(): void
     {
         $this->withoutExceptionHandling()->login()->loginNami();
@@ -213,11 +230,17 @@ class IndexTest extends TestCase
 
     public function testItLoadsGroups(): void
     {
-        $this->withoutExceptionHandling()->login()->loginNami();
-        Group::factory()->name('UUI')->create();
+        $parent1 = Group::factory()->name('par1')->create();
+        $child1 = Group::factory()->name('ch1')->for($parent1, 'parent')->create();
+        $child2 = Group::factory()->name('ch2')->for($parent1, 'parent')->create();
+        $parent2 = Group::factory()->name('par2')->create();
+        $this->withoutExceptionHandling()->login()->loginNami(12345, 'password', $parent1);
 
         $response = $this->get('/member');
 
-        $this->assertInertiaHas('UUI', $response, 'data.meta.groups.1.name');
+        $this->assertInertiaHas('par1', $response, 'data.meta.groups.0.name');
+        $this->assertInertiaHas('- ch1', $response, 'data.meta.groups.1.name');
+        $this->assertInertiaHas('- ch2', $response, 'data.meta.groups.2.name');
+        $this->assertInertiaHas('par2', $response, 'data.meta.groups.3.name');
     }
 }
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 784e1be6..95d5bbcd 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -29,11 +29,14 @@ abstract class TestCase extends BaseTestCase
         Auth::fake();
     }
 
-    public function loginNami(int $mglnr = 12345, string $password = 'password', int $groupId = 55): self
+    public function loginNami(int $mglnr = 12345, string $password = 'password', int|Group $groupId = 55): self
     {
         Auth::success($mglnr, $password);
-        $this->withNamiSettings($mglnr, $password, $groupId);
-        Group::factory()->create(['nami_id' => $groupId]);
+        $group = is_int($groupId)
+            ? Group::factory()->create(['nami_id' => $groupId])
+            : $groupId;
+
+        $this->withNamiSettings($mglnr, $password, $group->id);
 
         return $this;
     }