diff --git a/templates/zerver/api/changelog.md b/templates/zerver/api/changelog.md
index dddc0b9c11..ccaa5cb525 100644
--- a/templates/zerver/api/changelog.md
+++ b/templates/zerver/api/changelog.md
@@ -11,6 +11,12 @@ below features are supported.
 
 ## Changes in Zulip 5.0
 
+**Feature level 78**
+
+* `PATCH /settings`: Added `ignored_parameters_unsupported` field,
+  which is a list of parameters that were ignored by the endpoint,
+  to the response object.
+
 **Feature level 77**
 
 * [`GET /events`](/api/get-events): Removed `recipient_id` and
diff --git a/zerver/lib/request.py b/zerver/lib/request.py
index 9f3f747fd2..578a53c667 100644
--- a/zerver/lib/request.py
+++ b/zerver/lib/request.py
@@ -13,6 +13,7 @@ from typing import (
     MutableMapping,
     Optional,
     Sequence,
+    Set,
     TypeVar,
     Union,
     cast,
@@ -62,6 +63,8 @@ class ZulipRequestNotes:
     placeholder_open_graph_description: Optional[str] = None
     saved_response: Optional[HttpResponse] = None
     tornado_handler: Optional["handlers.AsyncDjangoHandler"] = None
+    processed_parameters: Set[str] = field(default_factory=set)
+    ignored_parameters: Set[str] = field(default_factory=set)
 
 
 request_notes_map: MutableMapping[HttpRequest, ZulipRequestNotes] = weakref.WeakKeyDictionary()
@@ -353,6 +356,7 @@ def has_request_variables(view_func: ViewFuncT) -> ViewFuncT:
 
     @wraps(view_func)
     def _wrapped_view_func(request: HttpRequest, *args: object, **kwargs: object) -> HttpResponse:
+        request_notes = get_request_notes(request)
         for param in post_params:
             func_var_name = param.func_var_name
             if param.path_only:
@@ -386,10 +390,13 @@ def has_request_variables(view_func: ViewFuncT) -> ViewFuncT:
             post_var_name: Optional[str] = None
 
             for req_var in post_var_names:
+                assert req_var is not None
                 if req_var in request.POST:
                     val = request.POST[req_var]
+                    request_notes.processed_parameters.add(req_var)
                 elif req_var in request.GET:
                     val = request.GET[req_var]
+                    request_notes.processed_parameters.add(req_var)
                 else:
                     # This is covered by test_REQ_aliases, but coverage.py
                     # fails to recognize this for some reason.
diff --git a/zerver/tests/test_settings.py b/zerver/tests/test_settings.py
index 78bf3f3da9..e0612e022f 100644
--- a/zerver/tests/test_settings.py
+++ b/zerver/tests/test_settings.py
@@ -409,6 +409,17 @@ class ChangeSettingsTest(ZulipTestCase):
                 result = self.client_post("/json/users/me/avatar", {"f1": fp1})
             self.assert_json_error(result, "Avatar changes are disabled in this organization.", 400)
 
+    def test_invalid_setting_name(self) -> None:
+        self.login("hamlet")
+
+        # Now try an invalid setting name
+        json_result = self.client_patch("/json/settings", dict(invalid_setting="value"))
+        self.assert_json_success(json_result)
+
+        result = orjson.loads(json_result.content)
+        self.assertIn("ignored_parameters_unsupported", result)
+        self.assertEqual(result["ignored_parameters_unsupported"], ["invalid_setting"])
+
 
 class UserChangesTest(ZulipTestCase):
     def test_update_api_key(self) -> None:
diff --git a/zerver/views/user_settings.py b/zerver/views/user_settings.py
index 5ae4325dca..36c944dfd0 100644
--- a/zerver/views/user_settings.py
+++ b/zerver/views/user_settings.py
@@ -173,6 +173,17 @@ def json_change_settings(
             # Note that check_change_full_name strips the passed name automatically
             result["full_name"] = check_change_full_name(user_profile, full_name, user_profile)
 
+    # TODO: Do this more generally.
+    from zerver.lib.request import get_request_notes
+
+    request_notes = get_request_notes(request)
+    for req_var in request.POST:
+        if req_var not in request_notes.processed_parameters:
+            request_notes.ignored_parameters.add(req_var)
+
+    if len(request_notes.ignored_parameters) > 0:
+        result["ignored_parameters_unsupported"] = list(request_notes.ignored_parameters)
+
     return json_success(result)