diff --git a/tests/components/plex/mock_classes.py b/tests/components/plex/mock_classes.py
index dd8e9a93ab8..f05c1017023 100644
--- a/tests/components/plex/mock_classes.py
+++ b/tests/components/plex/mock_classes.py
@@ -1,4 +1,9 @@
 """Mock classes used in tests."""
+from functools import lru_cache
+
+from aiohttp.helpers import reify
+from plexapi.exceptions import NotFound
+
 from homeassistant.components.plex.const import (
     CONF_SERVER,
     CONF_SERVER_IDENTIFIER,
@@ -116,11 +121,15 @@ class MockPlexServer:
 
         self._systemAccounts = list(map(MockPlexSystemAccount, range(num_users)))
 
+        self._library = None
+
         self._clients = []
         self._sessions = []
         self.set_clients(num_users)
         self.set_sessions(num_users, session_type)
 
+        self._cache = {}
+
     def set_clients(self, num_clients):
         """Set up mock PlexClients for this PlexServer."""
         self._clients = [MockPlexClient(self._baseurl, x) for x in range(num_clients)]
@@ -166,18 +175,32 @@ class MockPlexServer:
         """Mock version of PlexServer."""
         return "1.0"
 
-    @property
+    @reify
     def library(self):
         """Mock library object of PlexServer."""
-        return MockPlexLibrary()
+        return MockPlexLibrary(self)
 
     def playlist(self, playlist):
         """Mock the playlist lookup method."""
         return MockPlexMediaItem(playlist, mediatype="playlist")
 
+    @lru_cache()
+    def playlists(self):
+        """Mock the playlists lookup method with a lazy init."""
+        return [
+            MockPlexPlaylist(
+                self.library.section("Movies").all()
+                + self.library.section("TV Shows").all()
+            ),
+            MockPlexPlaylist(self.library.section("Music").all()),
+        ]
+
     def fetchItem(self, item):
         """Mock the fetchItem method."""
-        return MockPlexMediaItem("Item Name")
+        for section in self.library.sections():
+            result = section.fetchItem(item)
+            if result:
+                return result
 
 
 class MockPlexClient:
@@ -247,7 +270,7 @@ class MockPlexSession:
         self.TYPE = mediatype
         self.usernames = [list(MOCK_USERS)[index]]
         self.players = [player]
-        self._section = MockPlexLibrarySection()
+        self._section = MockPlexLibrarySection("Movies")
 
     @property
     def duration(self):
@@ -302,26 +325,80 @@ class MockPlexSession:
 class MockPlexLibrary:
     """Mock a Plex Library instance."""
 
-    def __init__(self):
+    def __init__(self, plex_server):
         """Initialize the object."""
+        self._plex_server = plex_server
+        self._sections = {}
 
-    def section(self, library_name):
+        for kind in ["Movies", "Music", "TV Shows", "Photos"]:
+            self._sections[kind] = MockPlexLibrarySection(kind)
+
+    def section(self, title):
         """Mock the LibrarySection lookup."""
-        return MockPlexLibrarySection(library_name)
+        section = self._sections.get(title)
+        if section:
+            return section
+        raise NotFound
+
+    def sections(self):
+        """Return all available sections."""
+        return self._sections.values()
+
+    def sectionByID(self, section_id):
+        """Mock the sectionByID lookup."""
+        return [x for x in self.sections() if x.key == section_id][0]
 
 
 class MockPlexLibrarySection:
     """Mock a Plex LibrarySection instance."""
 
-    def __init__(self, library="Movies"):
+    def __init__(self, library):
         """Initialize the object."""
         self.title = library
 
+        if library == "Music":
+            self._item = MockPlexArtist("Artist")
+        elif library == "TV Shows":
+            self._item = MockPlexShow("TV Show")
+        else:
+            self._item = MockPlexMediaItem(library[:-1])
+
     def get(self, query):
         """Mock the get lookup method."""
+        if self._item.title == query:
+            return self._item
+        raise NotFound
+
+    def all(self):
+        """Mock the all method."""
+        return [self._item]
+
+    def fetchItem(self, ratingKey):
+        """Return a specific item."""
+        for item in self.all():
+            if item.ratingKey == ratingKey:
+                return item
+            if item._children:
+                for child in item._children:
+                    if child.ratingKey == ratingKey:
+                        return child
+
+    @property
+    def type(self):
+        """Mock the library type."""
+        if self.title == "Movies":
+            return "movie"
         if self.title == "Music":
-            return MockPlexArtist(query)
-        return MockPlexMediaItem(query)
+            return "artist"
+        if self.title == "TV Shows":
+            return "show"
+        if self.title == "Photos":
+            return "photo"
+
+    @property
+    def key(self):
+        """Mock the key identifier property."""
+        return str(id(self.title))
 
 
 class MockPlexMediaItem:
@@ -331,27 +408,76 @@ class MockPlexMediaItem:
         """Initialize the object."""
         self.title = str(title)
         self.type = mediatype
+        self.thumbUrl = "http://1.2.3.4/thumb.png"
+        self._children = []
 
-    def album(self, album):
-        """Mock the album lookup method."""
-        return MockPlexMediaItem(album, mediatype="album")
+    def __iter__(self):
+        """Provide iterator."""
+        yield from self._children
 
-    def track(self, track):
-        """Mock the track lookup method."""
-        return MockPlexMediaTrack()
+    @property
+    def ratingKey(self):
+        """Mock the ratingKey property."""
+        return id(self.title)
 
-    def tracks(self):
-        """Mock the tracks lookup method."""
-        for index in range(1, 10):
-            yield MockPlexMediaTrack(index)
 
-    def episode(self, episode):
-        """Mock the episode lookup method."""
-        return MockPlexMediaItem(episode, mediatype="episode")
+class MockPlexPlaylist(MockPlexMediaItem):
+    """Mock a Plex Playlist instance."""
+
+    def __init__(self, items):
+        """Initialize the object."""
+        super().__init__(f"Playlist ({len(items)} Items)", "playlist")
+        for item in items:
+            self._children.append(item)
+
+
+class MockPlexShow(MockPlexMediaItem):
+    """Mock a Plex Show instance."""
+
+    def __init__(self, show):
+        """Initialize the object."""
+        super().__init__(show, "show")
+        for index in range(1, 5):
+            self._children.append(MockPlexSeason(index))
 
     def season(self, season):
         """Mock the season lookup method."""
-        return MockPlexMediaItem(season, mediatype="season")
+        return [x for x in self._children if x.title == f"Season {season}"][0]
+
+
+class MockPlexSeason(MockPlexMediaItem):
+    """Mock a Plex Season instance."""
+
+    def __init__(self, season):
+        """Initialize the object."""
+        super().__init__(f"Season {season}", "season")
+        for index in range(1, 10):
+            self._children.append(MockPlexMediaItem(f"Episode {index}", "episode"))
+
+    def episode(self, episode):
+        """Mock the episode lookup method."""
+        return self._children[episode - 1]
+
+
+class MockPlexAlbum(MockPlexMediaItem):
+    """Mock a Plex Album instance."""
+
+    def __init__(self, album):
+        """Initialize the object."""
+        super().__init__(album, "album")
+        for index in range(1, 10):
+            self._children.append(MockPlexMediaTrack(index))
+
+    def track(self, track):
+        """Mock the track lookup method."""
+        try:
+            return [x for x in self._children if x.title == track][0]
+        except IndexError:
+            raise NotFound
+
+    def tracks(self):
+        """Mock the tracks lookup method."""
+        return self._children
 
 
 class MockPlexArtist(MockPlexMediaItem):
@@ -359,12 +485,16 @@ class MockPlexArtist(MockPlexMediaItem):
 
     def __init__(self, artist):
         """Initialize the object."""
-        super().__init__(artist)
-        self.type = "artist"
+        super().__init__(artist, "artist")
+        self._album = MockPlexAlbum("Album")
+
+    def album(self, album):
+        """Mock the album lookup method."""
+        return self._album
 
     def get(self, track):
         """Mock the track lookup method."""
-        return MockPlexMediaTrack()
+        return self._album.track(track)
 
 
 class MockPlexMediaTrack(MockPlexMediaItem):
diff --git a/tests/components/plex/test_browse_media.py b/tests/components/plex/test_browse_media.py
new file mode 100644
index 00000000000..005fe4c9e44
--- /dev/null
+++ b/tests/components/plex/test_browse_media.py
@@ -0,0 +1,165 @@
+"""Tests for Plex media browser."""
+from homeassistant.components.media_player.const import (
+    ATTR_MEDIA_CONTENT_ID,
+    ATTR_MEDIA_CONTENT_TYPE,
+)
+from homeassistant.components.plex.const import CONF_SERVER_IDENTIFIER, DOMAIN
+from homeassistant.components.websocket_api.const import ERR_UNKNOWN_ERROR, TYPE_RESULT
+
+from .const import DEFAULT_DATA, DEFAULT_OPTIONS
+from .helpers import trigger_plex_update
+from .mock_classes import MockPlexAccount, MockPlexServer
+
+from tests.async_mock import patch
+from tests.common import MockConfigEntry
+
+
+async def test_browse_media(hass, hass_ws_client):
+    """Test getting Plex clients from plex.tv."""
+    entry = MockConfigEntry(
+        domain=DOMAIN,
+        data=DEFAULT_DATA,
+        options=DEFAULT_OPTIONS,
+        unique_id=DEFAULT_DATA["server_id"],
+    )
+
+    mock_plex_server = MockPlexServer(config_entry=entry)
+    mock_plex_account = MockPlexAccount()
+
+    with patch("plexapi.server.PlexServer", return_value=mock_plex_server), patch(
+        "plexapi.myplex.MyPlexAccount", return_value=mock_plex_account
+    ), patch(
+        "homeassistant.components.plex.PlexWebsocket", autospec=True
+    ) as mock_websocket:
+        entry.add_to_hass(hass)
+        assert await hass.config_entries.async_setup(entry.entry_id)
+        await hass.async_block_till_done()
+
+    websocket_client = await hass_ws_client(hass)
+
+    trigger_plex_update(mock_websocket)
+    await hass.async_block_till_done()
+
+    media_players = hass.states.async_entity_ids("media_player")
+    msg_id = 1
+
+    # Browse base of non-existent Plex server
+    await websocket_client.send_json(
+        {
+            "id": msg_id,
+            "type": "media_player/browse_media",
+            "entity_id": media_players[0],
+            ATTR_MEDIA_CONTENT_TYPE: "server",
+            ATTR_MEDIA_CONTENT_ID: "this server does not exist",
+        }
+    )
+
+    msg = await websocket_client.receive_json()
+    assert msg["id"] == msg_id
+    assert msg["type"] == TYPE_RESULT
+    assert not msg["success"]
+    assert msg["error"]["code"] == ERR_UNKNOWN_ERROR
+
+    # Browse base of Plex server
+    msg_id += 1
+    await websocket_client.send_json(
+        {
+            "id": msg_id,
+            "type": "media_player/browse_media",
+            "entity_id": media_players[0],
+        }
+    )
+
+    msg = await websocket_client.receive_json()
+    assert msg["id"] == msg_id
+    assert msg["type"] == TYPE_RESULT
+    assert msg["success"]
+    result = msg["result"]
+    assert result[ATTR_MEDIA_CONTENT_TYPE] == "server"
+    assert result[ATTR_MEDIA_CONTENT_ID] == DEFAULT_DATA[CONF_SERVER_IDENTIFIER]
+    assert len(result["children"]) == len(mock_plex_server.library.sections())
+
+    tvshows = next(iter(x for x in result["children"] if x["title"] == "TV Shows"))
+    playlists = next(iter(x for x in result["children"] if x["title"] == "Playlists"))
+
+    # Browse into a Plex TV show library
+    msg_id += 1
+    await websocket_client.send_json(
+        {
+            "id": msg_id,
+            "type": "media_player/browse_media",
+            "entity_id": media_players[0],
+            ATTR_MEDIA_CONTENT_TYPE: tvshows[ATTR_MEDIA_CONTENT_TYPE],
+            ATTR_MEDIA_CONTENT_ID: str(tvshows[ATTR_MEDIA_CONTENT_ID]),
+        }
+    )
+
+    msg = await websocket_client.receive_json()
+    assert msg["id"] == msg_id
+    assert msg["type"] == TYPE_RESULT
+    assert msg["success"]
+    result = msg["result"]
+    assert result[ATTR_MEDIA_CONTENT_TYPE] == "library"
+    result_id = result[ATTR_MEDIA_CONTENT_ID]
+    assert len(result["children"]) == len(
+        mock_plex_server.library.sectionByID(result_id).all()
+    )
+
+    # Browse into a Plex TV show
+    msg_id += 1
+    await websocket_client.send_json(
+        {
+            "id": msg_id,
+            "type": "media_player/browse_media",
+            "entity_id": media_players[0],
+            ATTR_MEDIA_CONTENT_TYPE: result["children"][0][ATTR_MEDIA_CONTENT_TYPE],
+            ATTR_MEDIA_CONTENT_ID: str(result["children"][0][ATTR_MEDIA_CONTENT_ID]),
+        }
+    )
+
+    msg = await websocket_client.receive_json()
+    assert msg["id"] == msg_id
+    assert msg["type"] == TYPE_RESULT
+    assert msg["success"]
+    result = msg["result"]
+    assert result[ATTR_MEDIA_CONTENT_TYPE] == "show"
+    result_id = int(result[ATTR_MEDIA_CONTENT_ID])
+    assert result["title"] == mock_plex_server.fetchItem(result_id).title
+
+    # Browse into a non-existent TV season
+    msg_id += 1
+    await websocket_client.send_json(
+        {
+            "id": msg_id,
+            "type": "media_player/browse_media",
+            "entity_id": media_players[0],
+            ATTR_MEDIA_CONTENT_TYPE: result["children"][0][ATTR_MEDIA_CONTENT_TYPE],
+            ATTR_MEDIA_CONTENT_ID: str(99999999999999),
+        }
+    )
+
+    msg = await websocket_client.receive_json()
+    assert msg["id"] == msg_id
+    assert msg["type"] == TYPE_RESULT
+    assert not msg["success"]
+    assert msg["error"]["code"] == ERR_UNKNOWN_ERROR
+
+    # Browse Plex playlists
+    msg_id += 1
+    await websocket_client.send_json(
+        {
+            "id": msg_id,
+            "type": "media_player/browse_media",
+            "entity_id": media_players[0],
+            ATTR_MEDIA_CONTENT_TYPE: playlists[ATTR_MEDIA_CONTENT_TYPE],
+            ATTR_MEDIA_CONTENT_ID: str(playlists[ATTR_MEDIA_CONTENT_ID]),
+        }
+    )
+
+    msg = await websocket_client.receive_json()
+    assert msg["id"] == msg_id
+    assert msg["type"] == TYPE_RESULT
+    assert msg["success"]
+    result = msg["result"]
+    assert result[ATTR_MEDIA_CONTENT_TYPE] == "playlists"
+    result_id = result[ATTR_MEDIA_CONTENT_ID]
diff --git a/tests/components/plex/test_server.py b/tests/components/plex/test_server.py
index 7da20846599..d911b258635 100644
--- a/tests/components/plex/test_server.py
+++ b/tests/components/plex/test_server.py
@@ -28,11 +28,13 @@ from .const import DEFAULT_DATA, DEFAULT_OPTIONS
 from .helpers import trigger_plex_update
 from .mock_classes import (
     MockPlexAccount,
+    MockPlexAlbum,
     MockPlexArtist,
     MockPlexLibrary,
     MockPlexLibrarySection,
-    MockPlexMediaItem,
+    MockPlexSeason,
     MockPlexServer,
+    MockPlexShow,
 )
 
 from tests.async_mock import patch
@@ -298,7 +300,7 @@ async def test_media_lookups(hass):
     with patch.object(MockPlexLibrary, "section", side_effect=NotFound):
         assert (
             loaded_server.lookup_media(
-                MEDIA_TYPE_EPISODE, library_name="Not a Library", show_name="A TV Show"
+                MEDIA_TYPE_EPISODE, library_name="Not a Library", show_name="TV Show"
             )
             is None
         )
@@ -316,37 +318,37 @@ async def test_media_lookups(hass):
         is None
     )
     assert loaded_server.lookup_media(
-        MEDIA_TYPE_EPISODE, library_name="TV Shows", show_name="A TV Show"
+        MEDIA_TYPE_EPISODE, library_name="TV Shows", show_name="TV Show"
     )
     assert loaded_server.lookup_media(
         MEDIA_TYPE_EPISODE,
         library_name="TV Shows",
-        show_name="A TV Show",
+        show_name="TV Show",
         season_number=2,
     )
     assert loaded_server.lookup_media(
         MEDIA_TYPE_EPISODE,
         library_name="TV Shows",
-        show_name="A TV Show",
+        show_name="TV Show",
         season_number=2,
         episode_number=3,
     )
-    with patch.object(MockPlexMediaItem, "season", side_effect=NotFound):
+    with patch.object(MockPlexShow, "season", side_effect=NotFound):
         assert (
             loaded_server.lookup_media(
                 MEDIA_TYPE_EPISODE,
                 library_name="TV Shows",
-                show_name="A TV Show",
+                show_name="TV Show",
                 season_number=2,
             )
             is None
         )
-    with patch.object(MockPlexMediaItem, "episode", side_effect=NotFound):
+    with patch.object(MockPlexSeason, "episode", side_effect=NotFound):
         assert (
             loaded_server.lookup_media(
                 MEDIA_TYPE_EPISODE,
                 library_name="TV Shows",
-                show_name="A TV Show",
+                show_name="TV Show",
                 season_number=2,
                 episode_number=1,
             )
@@ -356,24 +358,24 @@ async def test_media_lookups(hass):
     # Music searches
     assert (
         loaded_server.lookup_media(
-            MEDIA_TYPE_MUSIC, library_name="Music", album_name="An Album"
+            MEDIA_TYPE_MUSIC, library_name="Music", album_name="Album"
         )
         is None
     )
     assert loaded_server.lookup_media(
-        MEDIA_TYPE_MUSIC, library_name="Music", artist_name="An Artist"
+        MEDIA_TYPE_MUSIC, library_name="Music", artist_name="Artist"
     )
     assert loaded_server.lookup_media(
         MEDIA_TYPE_MUSIC,
         library_name="Music",
-        artist_name="An Artist",
-        track_name="A Track",
+        artist_name="Artist",
+        track_name="Track 3",
     )
     assert loaded_server.lookup_media(
         MEDIA_TYPE_MUSIC,
         library_name="Music",
-        artist_name="An Artist",
-        album_name="An Album",
+        artist_name="Artist",
+        album_name="Album",
     )
     with patch.object(MockPlexLibrarySection, "get", side_effect=NotFound):
         assert (
@@ -381,7 +383,7 @@ async def test_media_lookups(hass):
                 MEDIA_TYPE_MUSIC,
                 library_name="Music",
                 artist_name="Not an Artist",
-                album_name="An Album",
+                album_name="Album",
             )
             is None
         )
@@ -390,18 +392,18 @@ async def test_media_lookups(hass):
             loaded_server.lookup_media(
                 MEDIA_TYPE_MUSIC,
                 library_name="Music",
-                artist_name="An Artist",
+                artist_name="Artist",
                 album_name="Not an Album",
             )
             is None
         )
-    with patch.object(MockPlexMediaItem, "track", side_effect=NotFound):
+    with patch.object(MockPlexAlbum, "track", side_effect=NotFound):
         assert (
             loaded_server.lookup_media(
                 MEDIA_TYPE_MUSIC,
                 library_name="Music",
-                artist_name="An Artist",
-                album_name="An Album",
+                artist_name="Artist",
+                album_name=" Album",
                 track_name="Not a Track",
             )
             is None
@@ -411,7 +413,7 @@ async def test_media_lookups(hass):
             loaded_server.lookup_media(
                 MEDIA_TYPE_MUSIC,
                 library_name="Music",
-                artist_name="An Artist",
+                artist_name="Artist",
                 track_name="Not a Track",
             )
             is None
@@ -419,16 +421,16 @@ async def test_media_lookups(hass):
     assert loaded_server.lookup_media(
         MEDIA_TYPE_MUSIC,
         library_name="Music",
-        artist_name="An Artist",
-        album_name="An Album",
+        artist_name="Artist",
+        album_name="Album",
         track_number=3,
     )
     assert (
         loaded_server.lookup_media(
             MEDIA_TYPE_MUSIC,
             library_name="Music",
-            artist_name="An Artist",
-            album_name="An Album",
+            artist_name="Artist",
+            album_name="Album",
             track_number=30,
         )
         is None
@@ -436,9 +438,9 @@ async def test_media_lookups(hass):
     assert loaded_server.lookup_media(
         MEDIA_TYPE_MUSIC,
         library_name="Music",
-        artist_name="An Artist",
-        album_name="An Album",
-        track_name="A Track",
+        artist_name="Artist",
+        album_name="Album",
+        track_name="Track 3",
     )
 
     # Playlist searches
@@ -453,10 +455,10 @@ async def test_media_lookups(hass):
         )
 
     # Movie searches
-    assert loaded_server.lookup_media(MEDIA_TYPE_VIDEO, video_name="A Movie") is None
+    assert loaded_server.lookup_media(MEDIA_TYPE_VIDEO, video_name="Movie") is None
     assert loaded_server.lookup_media(MEDIA_TYPE_VIDEO, library_name="Movies") is None
     assert loaded_server.lookup_media(
-        MEDIA_TYPE_VIDEO, library_name="Movies", video_name="A Movie"
+        MEDIA_TYPE_VIDEO, library_name="Movies", video_name="Movie"
     )
     with patch.object(MockPlexLibrarySection, "get", side_effect=NotFound):
         assert (