Sunuwar, Sunuwar, or Kõinch, is a Kiranti language of the Sino-Tibetan language family spoken in Nepal and India by the Sunuwar people. It was first comprehensively attested by the Himalayan Languages Project. It is also known as Kõits Lo, Kiranti-Kõits, Mukhiya.

The Sunuwar or Koinch are a Tibeto-Burman ethnic group. a Kirati tribe native to Nepal, parts of India and southern Bhutan. They speak the Sunuwar language. According to the 2001 census of Nepal, 17% of the tribe follow the Kirant religion and adopt the Mundhum (Kiranti) culture.