diff --git a/open_strix/app.py b/open_strix/app.py
index 502b02b..11b5982 100644
--- a/open_strix/app.py
+++ b/open_strix/app.py
@@ -530,7 +530,12 @@ def should_process_discord_message(
         *,
         author_is_bot: bool,
         author_id: str | int | None,
+        channel_id: str | None = None,
     ) -> bool:
+        # Channel allowlist: if configured, only process messages from listed channels.
+        if self.config.discord_channel_allowlist and channel_id is not None:
+            if str(channel_id) not in self.config.discord_channel_allowlist:
+                return False
         if not author_is_bot:
             return True
         return self.should_respond_to_bot(author_id)
diff --git a/open_strix/config.py b/open_strix/config.py
index 220dbbe..0996206 100644
--- a/open_strix/config.py
+++ b/open_strix/config.py
@@ -29,6 +29,7 @@
 discord_messages_in_prompt: 10
 discord_token_env: DISCORD_TOKEN
 always_respond_bot_ids: []
+discord_channel_allowlist: []
 api_port: 0
 web_ui_port: 0
 web_ui_host: 127.0.0.1
@@ -182,6 +183,7 @@ class AppConfig:
     discord_messages_in_prompt: int = 10
     discord_token_env: str = "DISCORD_TOKEN"
     always_respond_bot_ids: set[str] = field(default_factory=set)
+    discord_channel_allowlist: set[str] = field(default_factory=set)
     session_log_retention_days: int = 30
     api_port: int = 0
     web_ui_port: int = 0
@@ -249,6 +251,7 @@ def load_config(layout: RepoLayout) -> AppConfig:
         discord_messages_in_prompt=int(loaded.get("discord_messages_in_prompt", 10)),
         discord_token_env=str(loaded.get("discord_token_env", "DISCORD_TOKEN")),
         always_respond_bot_ids=_normalize_id_list(loaded.get("always_respond_bot_ids")),
+        discord_channel_allowlist=_normalize_id_list(loaded.get("discord_channel_allowlist")),
         session_log_retention_days=int(loaded.get("session_log_retention_days", 30)),
         api_port=int(loaded.get("api_port", 0)),
         web_ui_port=int(loaded.get("web_ui_port", 0)),
diff --git a/open_strix/discord.py b/open_strix/discord.py
index 7de3611..53fa5de 100644
--- a/open_strix/discord.py
+++ b/open_strix/discord.py
@@ -177,9 +177,11 @@ async def on_ready(self) -> None:
 
     async def on_message(self, message: discord.Message) -> None:
         author_id = getattr(message.author, "id", None)
+        channel_id = str(getattr(message.channel, "id", ""))
         if not self._app.should_process_discord_message(
             author_is_bot=bool(getattr(message.author, "bot", False)),
             author_id=author_id,
+            channel_id=channel_id or None,
         ):
             return
         await self._app.handle_discord_message(message)
diff --git a/tests/test_discord.py b/tests/test_discord.py
index db4e170..4181218 100644
--- a/tests/test_discord.py
+++ b/tests/test_discord.py
@@ -87,6 +87,50 @@ def test_bot_allowlist_config_controls_message_processing(
     assert app.should_process_discord_message(author_is_bot=True, author_id="42") is True
 
 
+def test_channel_allowlist_filters_messages(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    _stub_agent_factory(monkeypatch)
+    (tmp_path / "config.yaml").write_text(
+        "discord_channel_allowlist:\n"
+        "  - '111'\n"
+        "  - '222'\n",
+        encoding="utf-8",
+    )
+    app = app_mod.OpenStrixApp(tmp_path)
+
+    # Allowed channel — should process
+    assert app.should_process_discord_message(
+        author_is_bot=False, author_id=None, channel_id="111"
+    ) is True
+    # Not in allowlist — should filter
+    assert app.should_process_discord_message(
+        author_is_bot=False, author_id=None, channel_id="999"
+    ) is False
+    # No channel_id — still processes (DMs, web UI, etc.)
+    assert app.should_process_discord_message(
+        author_is_bot=False, author_id=None, channel_id=None
+    ) is True
+
+
+def test_empty_channel_allowlist_processes_all(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    _stub_agent_factory(monkeypatch)
+    (tmp_path / "config.yaml").write_text(
+        "discord_channel_allowlist: []\n",
+        encoding="utf-8",
+    )
+    app = app_mod.OpenStrixApp(tmp_path)
+
+    # Empty allowlist — all channels should process
+    assert app.should_process_discord_message(
+        author_is_bot=False, author_id=None, channel_id="999"
+    ) is True
+
+
 def test_log_event_includes_stable_session_id_for_app_run(
     tmp_path: Path,
     monkeypatch: pytest.MonkeyPatch,