The Aos are a major Naga ethnic group native to Mokokchung District of Nagaland in Northeast India. Their main territory is from Tsüla (Dikhu) Valley in the east to Tsürang (Disai) Valley in the west in Mokokchung District.

Nagas are various ethnic groups native to northeastern India and northwestern Myanmar. The groups have similar cultures and traditions, and form the majority of population in the Indian state of Nagaland and Naga Self-Administered Zone of Myanmar (Burma); with significant populations in Manipur, Arunachal Pradesh and Assam in India; Sagaing Region and Kachin State in Myanmar.