diff --git a/homeassistant/components/knx/services.py b/homeassistant/components/knx/services.py
index 6def16df68a66..3341abd209abf 100644
--- a/homeassistant/components/knx/services.py
+++ b/homeassistant/components/knx/services.py
@@ -114,21 +114,27 @@ async def service_event_register_modify(call: ServiceCall) -> None:
     knx_module = get_knx_module(call.hass)
 
     attr_address = call.data[KNX_ADDRESS]
-    group_addresses = list(map(parse_device_group_address, attr_address))
+    group_addresses = set(map(parse_device_group_address, attr_address))
 
     if call.data.get(SERVICE_KNX_ATTR_REMOVE):
+        _error_gas = set()
         for group_address in group_addresses:
             try:
                 knx_module.knx_event_callback.group_addresses.remove(group_address)
-            # pylint: disable-next=home-assistant-action-swallowed-exception
             except ValueError:
-                _LOGGER.warning(
-                    "Service event_register could not remove event for '%s'",
-                    str(group_address),
-                )
+                _error_gas.add(group_address)
             if group_address in knx_module.group_address_transcoder:
                 del knx_module.group_address_transcoder[group_address]
-        return
+
+        if not _error_gas:
+            return
+        raise HomeAssistantError(
+            translation_domain=DOMAIN,
+            translation_key="service_event_register_ga_not_found",
+            translation_placeholders={
+                "group_addresses": ", ".join(map(str, sorted(_error_gas)))
+            },
+        )
 
     if (dpt := call.data.get(CONF_TYPE)) and (
         transcoder := DPTBase.parse_transcoder(dpt)
diff --git a/homeassistant/components/knx/strings.json b/homeassistant/components/knx/strings.json
index 3abb766c958e6..1e041a87fe7b2 100644
--- a/homeassistant/components/knx/strings.json
+++ b/homeassistant/components/knx/strings.json
@@ -1094,6 +1094,9 @@
     "integration_not_loaded": {
       "message": "KNX integration is not loaded."
     },
+    "service_event_register_ga_not_found": {
+      "message": "Could not find registered event for `{group_addresses}` to remove."
+    },
     "service_exposure_remove_not_found": {
       "message": "Could not find exposure for `{group_address}` to remove."
     },
diff --git a/tests/components/knx/test_services.py b/tests/components/knx/test_services.py
index 617d2f31bc073..c0961512b0eff 100644
--- a/tests/components/knx/test_services.py
+++ b/tests/components/knx/test_services.py
@@ -194,6 +194,18 @@ async def test_event_register(hass: HomeAssistant, knx: KNXTestKit) -> None:
     assert untyped_event_1.data["data"] is True
     assert untyped_event_1.data["value"] is None
 
+    # remove event for non-registered address - raise error
+    with pytest.raises(HomeAssistantError) as exc_info:
+        await hass.services.async_call(
+            "knx",
+            "event_register",
+            {"address": "4/4/4", "remove": True},
+            blocking=True,
+        )
+    assert exc_info.value.translation_domain == DOMAIN
+    assert exc_info.value.translation_key == "service_event_register_ga_not_found"
+    assert exc_info.value.translation_placeholders == {"group_addresses": "4/4/4"}
+
 
 async def test_exposure_register(hass: HomeAssistant, knx: KNXTestKit) -> None:
     """Test `knx.exposure_register` service."""