diff --git a/homeassistant/components/plex/const.py b/homeassistant/components/plex/const.py
index b914a89f744..9823443b897 100644
--- a/homeassistant/components/plex/const.py
+++ b/homeassistant/components/plex/const.py
@@ -46,3 +46,4 @@ MANUAL_SETUP_STRING = "Configure Plex server manually"
 
 SERVICE_PLAY_ON_SONOS = "play_on_sonos"
 SERVICE_REFRESH_LIBRARY = "refresh_library"
+SERVICE_SCAN_CLIENTS = "scan_for_clients"
diff --git a/homeassistant/components/plex/services.py b/homeassistant/components/plex/services.py
index cd127c1465e..23dea809a0d 100644
--- a/homeassistant/components/plex/services.py
+++ b/homeassistant/components/plex/services.py
@@ -4,7 +4,15 @@ import logging
 from plexapi.exceptions import NotFound
 import voluptuous as vol
 
-from .const import DOMAIN, SERVERS, SERVICE_REFRESH_LIBRARY
+from homeassistant.helpers.dispatcher import async_dispatcher_send
+
+from .const import (
+    DOMAIN,
+    PLEX_UPDATE_PLATFORMS_SIGNAL,
+    SERVERS,
+    SERVICE_REFRESH_LIBRARY,
+    SERVICE_SCAN_CLIENTS,
+)
 
 REFRESH_LIBRARY_SCHEMA = vol.Schema(
     {vol.Optional("server_name"): str, vol.Required("library_name"): str}
@@ -19,12 +27,20 @@ async def async_setup_services(hass):
     async def async_refresh_library_service(service_call):
         await hass.async_add_executor_job(refresh_library, hass, service_call)
 
+    async def async_scan_clients_service(_):
+        _LOGGER.info("Scanning for new Plex clients")
+        for server_id in hass.data[DOMAIN][SERVERS]:
+            async_dispatcher_send(hass, PLEX_UPDATE_PLATFORMS_SIGNAL.format(server_id))
+
     hass.services.async_register(
         DOMAIN,
         SERVICE_REFRESH_LIBRARY,
         async_refresh_library_service,
         schema=REFRESH_LIBRARY_SCHEMA,
     )
+    hass.services.async_register(
+        DOMAIN, SERVICE_SCAN_CLIENTS, async_scan_clients_service
+    )
 
     return True
 
diff --git a/homeassistant/components/plex/services.yaml b/homeassistant/components/plex/services.yaml
index e9fb40939b3..366acb43a5b 100644
--- a/homeassistant/components/plex/services.yaml
+++ b/homeassistant/components/plex/services.yaml
@@ -21,3 +21,6 @@ refresh_library:
     library_name:
       description: Name of the Plex library to refresh.
       example: "TV Shows"
+
+scan_for_clients:
+  description: Scan for available clients from the Plex server(s), local network, and plex.tv.
diff --git a/tests/components/plex/test_services.py b/tests/components/plex/test_services.py
index b40c9f6d4d3..078ba3b97e9 100644
--- a/tests/components/plex/test_services.py
+++ b/tests/components/plex/test_services.py
@@ -5,6 +5,7 @@ from homeassistant.components.plex.const import (
     DOMAIN,
     PLEX_SERVER_CONFIG,
     SERVICE_REFRESH_LIBRARY,
+    SERVICE_SCAN_CLIENTS,
 )
 from homeassistant.const import (
     CONF_HOST,
@@ -100,3 +101,28 @@ async def test_refresh_library(hass):
             True,
         )
         assert not mock_update.called
+
+
+async def test_scan_clients(hass):
+    """Test scan_for_clients service call."""
+    entry = MockConfigEntry(
+        domain=DOMAIN,
+        data=DEFAULT_DATA,
+        options=DEFAULT_OPTIONS,
+        unique_id=DEFAULT_DATA["server_id"],
+    )
+
+    mock_plex_server = MockPlexServer(config_entry=entry)
+
+    with patch("plexapi.server.PlexServer", return_value=mock_plex_server), patch(
+        "plexapi.myplex.MyPlexAccount", return_value=MockPlexAccount()
+    ), patch("homeassistant.components.plex.PlexWebsocket", autospec=True):
+        entry.add_to_hass(hass)
+        assert await hass.config_entries.async_setup(entry.entry_id)
+        await hass.async_block_till_done()
+
+    assert await hass.services.async_call(
+        DOMAIN,
+        SERVICE_SCAN_CLIENTS,
+        blocking=True,
+    )