diff --git a/homeassistant/components/media_player/__init__.py b/homeassistant/components/media_player/__init__.py
index d0c6bcabfcf..b2cb7d76e8f 100644
--- a/homeassistant/components/media_player/__init__.py
+++ b/homeassistant/components/media_player/__init__.py
@@ -1041,7 +1041,8 @@ class MediaPlayerEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
 
         if self.state in {
             MediaPlayerState.OFF,
-            MediaPlayerState.STANDBY,
+            # Not comparing to MediaPlayerState.STANDBY to avoid deprecation warning
+            "standby",
         }:
             await self.async_turn_on()
         else:
diff --git a/homeassistant/components/media_player/const.py b/homeassistant/components/media_player/const.py
index 8d85d7cd106..f842ccccb65 100644
--- a/homeassistant/components/media_player/const.py
+++ b/homeassistant/components/media_player/const.py
@@ -5,6 +5,7 @@ from functools import partial
 
 from homeassistant.helpers.deprecation import (
     DeprecatedConstantEnum,
+    EnumWithDeprecatedMembers,
     all_with_deprecated_constants,
     check_if_deprecated_constant,
     dir_with_deprecated_constants,
@@ -50,7 +51,13 @@ ATTR_SOUND_MODE_LIST = "sound_mode_list"
 DOMAIN = "media_player"
 
 
-class MediaPlayerState(StrEnum):
+class MediaPlayerState(
+    StrEnum,
+    metaclass=EnumWithDeprecatedMembers,
+    deprecated={
+        "STANDBY": ("MediaPlayerState.OFF or MediaPlayerState.IDLE", "2026.8.0"),
+    },
+):
     """State of media player entities."""
 
     OFF = "off"