Northern Thiladhunmathi Atoll, Thiladhummathi North or Haa Alifu Atoll is the northernmost administrative division of the Maldives.

Haa Alifu includes Ihavandhippulhu, the northern-most natural atoll of the Maldives, as well as a section of the larger Thiladummathi or Tiladummati Atoll. It contains 42 islands, 16 of which are inhabited.