You can watch IT: Welcome to Derry on Max (HBO Max) in the United States, with additional viewing options depending on where you are. Direct answer

• Primary option: Stream on Max (HBO Max) in supported regions. If you already have Max, you can search for IT: Welcome to Derry and start watching the series there.

• Alternative viewing paths in the US: You can also access the series via the Max Amazon Channel or by purchasing/renting individual episodes on services like Amazon Prime Video or Apple TV.

• Availability by region: The series is typically available on local equivalents or bundled platforms outside the US (e.g., Crave in Canada; Sky Atlantic/Now in the UK; other regional providers may carry Max as an add-on or have exclusive rights). Check your local streaming catalog for IT: Welcome to Derry.

If you’d like, specify your country or streaming subscriptions, and provide any constraints (budget, ad tolerance, resolution preference), and the best current watching options can be tailored to that location.