diff --git a/homeassistant/components/assist_pipeline/websocket_api.py b/homeassistant/components/assist_pipeline/websocket_api.py
index 57e2cc8b398..6d8fd02a217 100644
--- a/homeassistant/components/assist_pipeline/websocket_api.py
+++ b/homeassistant/components/assist_pipeline/websocket_api.py
@@ -332,7 +332,7 @@ async def websocket_list_languages(
             dialect = language_util.Dialect.parse(language_tag)
             languages.add(dialect.language)
         if pipeline_languages is not None:
-            pipeline_languages &= languages
+            pipeline_languages = language_util.intersect(pipeline_languages, languages)
         else:
             pipeline_languages = languages
 
@@ -342,11 +342,15 @@ async def websocket_list_languages(
             dialect = language_util.Dialect.parse(language_tag)
             languages.add(dialect.language)
         if pipeline_languages is not None:
-            pipeline_languages &= languages
+            pipeline_languages = language_util.intersect(pipeline_languages, languages)
         else:
             pipeline_languages = languages
 
     connection.send_result(
         msg["id"],
-        {"languages": pipeline_languages},
+        {
+            "languages": sorted(pipeline_languages)
+            if pipeline_languages
+            else pipeline_languages
+        },
     )
diff --git a/homeassistant/util/language.py b/homeassistant/util/language.py
index 4ec8c74ffa9..73db81c91ce 100644
--- a/homeassistant/util/language.py
+++ b/homeassistant/util/language.py
@@ -199,3 +199,14 @@ def matches(
 
     # Score < 0 is not a match
     return [tag for _dialect, score, tag in scored if score[0] >= 0]
+
+
+def intersect(languages_1: set[str], languages_2: set[str]) -> set[str]:
+    """Intersect two sets of languages using is_match for aliases."""
+    languages = set()
+    for lang_1 in languages_1:
+        for lang_2 in languages_2:
+            if is_language_match(lang_1, lang_2):
+                languages.add(lang_1)
+
+    return languages
diff --git a/tests/components/assist_pipeline/test_websocket.py b/tests/components/assist_pipeline/test_websocket.py
index ca631be4549..a7ba9063b3f 100644
--- a/tests/components/assist_pipeline/test_websocket.py
+++ b/tests/components/assist_pipeline/test_websocket.py
@@ -1633,3 +1633,29 @@ async def test_list_pipeline_languages(
     msg = await client.receive_json()
     assert msg["success"]
     assert msg["result"] == {"languages": ["en"]}
+
+
+async def test_list_pipeline_languages_with_aliases(
+    hass: HomeAssistant,
+    hass_ws_client: WebSocketGenerator,
+    init_components,
+) -> None:
+    """Test listing pipeline languages using aliases."""
+    client = await hass_ws_client(hass)
+
+    with patch(
+        "homeassistant.components.conversation.async_get_conversation_languages",
+        return_value={"he", "nb"},
+    ), patch(
+        "homeassistant.components.stt.async_get_speech_to_text_languages",
+        return_value={"he", "no"},
+    ), patch(
+        "homeassistant.components.tts.async_get_text_to_speech_languages",
+        return_value={"iw", "nb"},
+    ):
+        await client.send_json_auto_id({"type": "assist_pipeline/language/list"})
+
+        # result
+        msg = await client.receive_json()
+        assert msg["success"]
+        assert msg["result"] == {"languages": ["he", "nb"]}