Where can I find my watch list on Apple TV?

On what device are you looking for this? On the Apple TV box (which model), in the Apple TV app on a smart TV (which brand and model), or on a different device (please specify)?

The items that you have added to your Watchlist, and the compatible items that you have started watching but have not completed yet, those items will be listed in the ‘Continue Watching’ (Up Next on older OS versions) row in the Apple TV app. Movies that you have completed will be removed from that list. TV shows will list episodes there, and if you have completely seen all available episodes, the listing will be removed from that list, until a new episode is released. Rewatching something will reset the watch progress for Continue Watching.

See it as a queue list of things that you may consider watching next at any time. It is not a favorites list, and it will be frustrating to try to use it that way. Nor is it an easy entry point to an episode overview.

There is a main Continue Watching list in the Home tab of the Apple TV app.

There is a secondary Continue Watching list in the Apple TV+ tab of the Apple TV app, filtered for Apple TV+ content.

The row is horizontally scrollable, to reveal more than fits in the screen width (if applicable). iPhone, iPad, Mac have a “>” button next to Continue Watching/Up Next, where you can see the list content on a separate page, instead of in one row on the previous page.