diff --git a/admin_api/views.py b/admin_api/views.py
index 69a87c6..b13e7e0 100644
--- a/admin_api/views.py
+++ b/admin_api/views.py
@@ -585,7 +585,8 @@ class UserListView(APIView):
         from django.contrib.auth import get_user_model
         from django.db.models import Q
         User = get_user_model()
-        qs = User.objects.filter(is_superuser=False)
+        include_all = request.query_params.get('include_all', '0') == '1'
+        qs = User.objects.all() if include_all else User.objects.filter(is_superuser=False)
 
         # Server-side search
         search = request.query_params.get('search', '').strip()