The Tutsa are a Naga people living in the southern parts of Changlang and the eastern part of Tirap districts of the Indian state of Arunachal Pradesh. Ethnically, the Tutsa are closely related to the Tangsa and were classified as members of the Tangsa in all census records until 1981. As of 2001 their population stood at 25,000.
The harvest festival of Pongtu is the principal festival of the Tutsa.
The Tutsa are traditionally followers of Animism. Of late (when?), Baptist missionaries allegedly partially supported by the National Socialist Council of Nagaland have converted some Tutsa to Christianity. The sizeable Christian Tutsa community have formed the Tutsa Baptist Churches Council (TBCC).