diff --git a/openslides_backend/presenter/search_users.py b/openslides_backend/presenter/search_users.py
index 6cc1ad472..84a7d0e13 100644
--- a/openslides_backend/presenter/search_users.py
+++ b/openslides_backend/presenter/search_users.py
@@ -21,7 +21,7 @@
 from .base import BasePresenter
 from .presenter import register_presenter
 
-search_fields = [["username"], ["first_name", "last_name", "email"]]
+search_fields = [["username"], ["saml_id"], ["first_name", "last_name", "email"]]
 all_fields = [field for fields in search_fields for field in fields]
 
 search_users_schema = fastjsonschema.compile(
@@ -57,8 +57,9 @@
 @register_presenter("search_users")
 class SearchUsers(BasePresenter):
     """
-    Matches users to the search criteria either by username or by exact match of first name, last
-    name AND email. Returns a list of users for each search criteria in payload order.
+    Matches users to the search criteria either by username or saml id or
+    by exact match of first name, last name AND email.
+    Returns a list of users for each search criteria in payload order.
     """
 
     schema = search_users_schema
@@ -97,11 +98,12 @@ def get_result(self) -> List[List[Dict[str, Any]]]:
             current_result = []
             for instance in instances.values():
                 for search_def in search_fields:
-                    if all(
-                        (instance.get(field) or "").lower() == search[field]
-                        for field in search_def
-                    ):
-                        current_result.append(instance)
+                    if any(search[field] for field in search_def):
+                        if all(
+                            (instance.get(field) or "").lower() == search[field]
+                            for field in search_def
+                        ):
+                            current_result.append(instance)
                         break
             result.append(current_result)
         return result
diff --git a/tests/system/presenter/test_search_users.py b/tests/system/presenter/test_search_users.py
index 901de93ec..c041be3d0 100644
--- a/tests/system/presenter/test_search_users.py
+++ b/tests/system/presenter/test_search_users.py
@@ -19,6 +19,7 @@ def setUp(self) -> None:
             "first_name": "first2",
             "last_name": "last2",
             "username": "user2",
+            "saml_id": None,
         }
         self.user3 = {
             "id": 3,
@@ -26,6 +27,7 @@ def setUp(self) -> None:
             "first_name": "first3",
             "last_name": "last3",
             "username": "user3",
+            "saml_id": None,
         }
         self.user4 = {
             "id": 4,
@@ -33,7 +35,17 @@ def setUp(self) -> None:
             "first_name": "first4",
             "last_name": "last4",
             "username": "user4",
+            "saml_id": None,
         }
+        self.user5 = {
+            "id": 5,
+            "email": "userX@test.de",
+            "first_name": "first5",
+            "last_name": "last5",
+            "username": "user5",
+            "saml_id": "saml5",
+        }
+
         self.set_models(
             {
                 "user/2": {
@@ -45,6 +57,9 @@ def setUp(self) -> None:
                 "user/4": {
                     **self.user4,
                 },
+                "user/5": {
+                    **self.user5,
+                },
             }
         )
 
@@ -87,15 +102,32 @@ def test_search_fields_variations(self) -> None:
                         "first_name": "first4",
                         "last_name": "last4",
                     },
+                    {
+                        "username": "user2",
+                        "saml_id": "saml5",
+                    },
+                    {
+                        "saml_id": "saml5",
+                        "email": "userX@test.de",
+                        "first_name": "first4",
+                        "last_name": "last4",
+                    },
+                    {
+                        "username": "userX",
+                        "saml_id": "saml5",
+                    },
                 ],
             },
         )
         self.assertEqual(status_code, 200)
-        self.assertEqual(len(data), 4)
+        self.assertEqual(len(data), 7)
         self.assertEqual(data[0], [self.user2])
         self.assertEqual(data[1], [])
         self.assertEqual(data[2], [self.user2])
         self.assertEqual(data[3], [self.user4])
+        self.assertEqual(data[4], [self.user2])
+        self.assertEqual(data[5], [self.user5])
+        self.assertEqual(data[6], [])
 
     def test_search_ignore_case_strip(self) -> None:
         status_code, data = self.request(
@@ -129,7 +161,7 @@ def test_search_all_fields_username_match(self) -> None:
                 "search": [
                     {
                         "username": "user2",
-                        "email": "user4@test.de",
+                        "email": "userX@test.de",
                         "first_name": "first4",
                         "last_name": "last4",
                     },