Nunivak Cup'ig or just Cup'ig (own name Cugtun) is a language or separate dialect of Central Alaskan Yup'ik spoken in Central Alaska at the Nunivak Island by Nunivak Cup'ig people (own name Cup'it or Nuniwarmiut). The letter "c" in the Yup’ik alphabet is equivalent to the English alphabet "ch".
The Central Alaskan Yupik who live on Nunivak Island (Nuniwar in Nunivak Cup'ig, Nunivaaq in Central Yup'ik) call themselves Cup'ig (plural Cup'it). Those who live in the village of Chevak call themselves Cup'ik (plural Cup'it). The name Cup'ig (with g) is used for the Nunivak Island Yup'ik dialect and the name Cup'ik (with k) is used for Hooper Bay-Chevak Yup'ik dialect.