diff --git a/homeassistant/util/__init__.py b/homeassistant/util/__init__.py
index de16a2d23d2..6d77f67161d 100644
--- a/homeassistant/util/__init__.py
+++ b/homeassistant/util/__init__.py
@@ -10,6 +10,7 @@ import random
 import string
 from functools import wraps
 from types import MappingProxyType
+from unicodedata import normalize
 
 from typing import Any, Optional, TypeVar, Callable, Sequence, KeysView, Union
 
@@ -35,7 +36,7 @@ def sanitize_path(path: str) -> str:
 
 def slugify(text: str) -> str:
     """Slugify a given text."""
-    text = text.lower().replace(" ", "_")
+    text = normalize('NFKD', text).lower().replace(" ", "_")
 
     return RE_SLUGIFY.sub("", text)
 
diff --git a/tests/util/test_init.py b/tests/util/test_init.py
index 9bfd6ebd6ed..d6d583342d7 100644
--- a/tests/util/test_init.py
+++ b/tests/util/test_init.py
@@ -30,6 +30,7 @@ class TestUtil(unittest.TestCase):
         self.assertEqual("test", util.slugify("T-!@#$!#@$!$est"))
         self.assertEqual("test_more", util.slugify("Test More"))
         self.assertEqual("test_more", util.slugify("Test_(More)"))
+        self.assertEqual("test_more", util.slugify("Tèst_Mörê"))
 
     def test_repr_helper(self):
         """Test repr_helper."""