Nunivak Cup'ig or just Cup'ig is a language or separate dialect of Central Alaskan Yup'ik spoken in Central Alaska at the Nunivak Island by Nunivak Cup'ig people. The letter "c" in the Yup’ik alphabet is equivalent to the English alphabet "ch".

The Yupʼik or Yupiaq and Yupiit or Yupiat (pl), also Central Alaskan Yupʼik, Central Yupʼik, Alaskan Yupʼik, are an Indigenous people of western and southwestern Alaska ranging from southern Norton Sound southwards along the coast of the Bering Sea on the Yukon-Kuskokwim Delta and along the northern coast of Bristol Bay as far east as Nushagak Bay and the northern Alaska Peninsula at Naknek River and Egegik Bay. They are also known as Cupʼik by the Chevak Cupʼik dialect-speaking people of Chevak and Cupʼig for the Nunivak Cupʼig dialect-speaking people of Nunivak Island.