diff --git a/src/tuimble/client.py b/src/tuimble/client.py
index f1a2586..04bb184 100644
--- a/src/tuimble/client.py
+++ b/src/tuimble/client.py
@@ -181,6 +181,14 @@ class MumbleClient:
         if self._mumble and self._connected:
             self._mumble.channels[channel_id].move_in()
 
+    def set_self_deaf(self, deaf: bool):
+        """Toggle self-deafen on the server."""
+        if self._mumble and self._connected:
+            if deaf:
+                self._mumble.users.myself.deafen()
+            else:
+                self._mumble.users.myself.undeafen()
+
     # -- pymumble callbacks (run on pymumble thread) -------------------------
 
     def _register_callbacks(self):
diff --git a/tests/test_client.py b/tests/test_client.py
index 792a419..a998d23 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -1,5 +1,7 @@
 """Tests for MumbleClient dispatcher and callback wiring."""
 
+from unittest.mock import MagicMock
+
 from tuimble.client import MumbleClient
 
 
@@ -39,3 +41,29 @@ def test_dispatch_skips_none_callback():
     client = MumbleClient(host="localhost")
     # Should not raise
     client._dispatch(None)
+
+
+def test_set_self_deaf_calls_pymumble():
+    client = MumbleClient(host="localhost")
+    client._connected = True
+    myself = MagicMock()
+    users = MagicMock()
+    users.myself = myself
+    mumble = MagicMock()
+    mumble.users = users
+    client._mumble = mumble
+
+    client.set_self_deaf(True)
+    myself.deafen.assert_called_once()
+    myself.undeafen.assert_not_called()
+
+    myself.reset_mock()
+    client.set_self_deaf(False)
+    myself.undeafen.assert_called_once()
+    myself.deafen.assert_not_called()
+
+
+def test_set_self_deaf_noop_when_disconnected():
+    client = MumbleClient(host="localhost")
+    # Should not raise when not connected
+    client.set_self_deaf(True)