diff --git a/plugins/chanmgmt.py b/plugins/chanmgmt.py
index c6f25ba..3155411 100644
--- a/plugins/chanmgmt.py
+++ b/plugins/chanmgmt.py
@@ -1,6 +1,10 @@
-"""Channel management: kick, ban, unban, topic, mode."""
+"""Channel management: kick, ban, unban, topic, mode, invite-join."""
 
-from derp.plugin import command
+import logging
+
+from derp.plugin import command, event
+
+log = logging.getLogger(__name__)
 
 
 def _require_channel(message):
@@ -79,3 +83,16 @@ async def cmd_mode(bot, message):
     mode_str = parts[1]
     args = parts[2:]
     await bot.mode(message.target, mode_str, *args)
+
+
+@event("INVITE")
+async def on_invite(bot, message):
+    """Join a channel when invited by an admin or IRC operator."""
+    if not bot._is_admin(message):
+        log.info("ignoring invite from non-admin %s", message.nick)
+        return
+    channel = message.params[1] if len(message.params) > 1 else None
+    if not channel:
+        return
+    log.info("accepting invite to %s from %s", channel, message.nick)
+    await bot.join(channel)
diff --git a/tests/test_chanmgmt.py b/tests/test_chanmgmt.py
new file mode 100644
index 0000000..f39dd57
--- /dev/null
+++ b/tests/test_chanmgmt.py
@@ -0,0 +1,81 @@
+"""Tests for the chanmgmt plugin (invite-join)."""
+
+import asyncio
+import importlib.util
+import sys
+from pathlib import Path
+
+from derp.irc import Message
+
+# plugins/ is not a Python package -- load the module from file path
+_spec = importlib.util.spec_from_file_location(
+    "plugins.chanmgmt",
+    Path(__file__).resolve().parent.parent / "plugins" / "chanmgmt.py",
+)
+_mod = importlib.util.module_from_spec(_spec)
+sys.modules[_spec.name] = _mod
+_spec.loader.exec_module(_mod)
+
+from plugins.chanmgmt import on_invite  # noqa: E402  # isort: skip
+
+
+# -- Helpers -----------------------------------------------------------------
+
+class _FakeConn:
+    """Minimal connection stand-in."""
+
+    def __init__(self):
+        self.sent: list[str] = []
+
+    async def send(self, raw: str) -> None:
+        self.sent.append(raw)
+
+
+class _FakeBot:
+    """Minimal bot stand-in."""
+
+    def __init__(self, *, admin: bool = False):
+        self.joined: list[str] = []
+        self._admin = admin
+        self.conn = _FakeConn()
+
+    def _is_admin(self, message) -> bool:
+        return self._admin
+
+    async def join(self, channel: str) -> None:
+        self.joined.append(channel)
+
+
+def _invite(nick: str, channel: str) -> Message:
+    """Create an INVITE message: :nick!user@host INVITE botname #channel."""
+    return Message(
+        raw="",
+        prefix=f"{nick}!~{nick}@host",
+        nick=nick,
+        command="INVITE",
+        params=["derp", channel],
+        tags={},
+    )
+
+
+# -- Tests -------------------------------------------------------------------
+
+class TestOnInvite:
+    def test_admin_joins(self):
+        bot = _FakeBot(admin=True)
+        asyncio.run(on_invite(bot, _invite("oper", "#secret")))
+        assert "#secret" in bot.joined
+
+    def test_non_admin_ignored(self):
+        bot = _FakeBot(admin=False)
+        asyncio.run(on_invite(bot, _invite("rando", "#trap")))
+        assert bot.joined == []
+
+    def test_missing_channel_ignored(self):
+        bot = _FakeBot(admin=True)
+        msg = Message(
+            raw="", prefix="oper!~oper@host", nick="oper",
+            command="INVITE", params=["derp"], tags={},
+        )
+        asyncio.run(on_invite(bot, msg))
+        assert bot.joined == []