diff --git a/homeassistant/components/group/light.py b/homeassistant/components/group/light.py
index 84c218b5d72..4357085ef8a 100644
--- a/homeassistant/components/group/light.py
+++ b/homeassistant/components/group/light.py
@@ -371,6 +371,10 @@ class LightGroup(GroupEntity, light.LightEntity):
         if all_effect_lists:
             # Merge all effects from all effect_lists with a union merge.
             self._effect_list = list(set().union(*all_effect_lists))
+            self._effect_list.sort()
+            if "None" in self._effect_list:
+                self._effect_list.remove("None")
+                self._effect_list.insert(0, "None")
 
         self._effect = None
         all_effects = list(_find_state_attributes(on_states, ATTR_EFFECT))
diff --git a/tests/components/group/test_light.py b/tests/components/group/test_light.py
index c9b861a46a9..b409786dc07 100644
--- a/tests/components/group/test_light.py
+++ b/tests/components/group/test_light.py
@@ -656,6 +656,10 @@ async def test_effect_list(hass):
     await hass.async_block_till_done()
     state = hass.states.get("light.light_group")
     assert set(state.attributes[ATTR_EFFECT_LIST]) == {"None", "Random", "Colorloop"}
+    # These ensure the output is sorted as expected
+    assert state.attributes[ATTR_EFFECT_LIST][0] == "None"
+    assert state.attributes[ATTR_EFFECT_LIST][1] == "Colorloop"
+    assert state.attributes[ATTR_EFFECT_LIST][2] == "Random"
 
     hass.states.async_set(
         "light.test2",