diff --git a/homeassistant/components/alexa/entities.py b/homeassistant/components/alexa/entities.py
index 8319e146d9f..e002969952a 100644
--- a/homeassistant/components/alexa/entities.py
+++ b/homeassistant/components/alexa/entities.py
@@ -300,12 +300,6 @@ class AlexaEntity:
         """
         raise NotImplementedError
 
-    def get_interface(self, capability) -> AlexaCapability:
-        """Return the given AlexaInterface.
-
-        Raises _UnsupportedInterface.
-        """
-
     def interfaces(self) -> list[AlexaCapability]:
         """Return a list of supported interfaces.
 
diff --git a/homeassistant/components/alexa/errors.py b/homeassistant/components/alexa/errors.py
index 0ce00f1fe48..5f0de6f7467 100644
--- a/homeassistant/components/alexa/errors.py
+++ b/homeassistant/components/alexa/errors.py
@@ -8,10 +8,6 @@ from homeassistant.exceptions import HomeAssistantError
 from .const import API_TEMP_UNITS
 
 
-class UnsupportedInterface(HomeAssistantError):
-    """This entity does not support the requested Smart Home API interface."""
-
-
 class UnsupportedProperty(HomeAssistantError):
     """This entity does not support the requested Smart Home API property."""