Haa Alif Atoll is the code name based on the letters of the Maldivian alphabet commonly used to refer to the administrative division officially known as North Thiladhunmathi Atoll (Maldivian: Thiladhunmathi Uthuruburi) in the Maldives.

It is the northernmost of the 19 administrative divisions (known as "Atolls") of the country, and is the third-largest administrative division in terms of population and land area.