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".

Central Alaskan Yupʼik is one of the languages of the Yupik family, in turn a member of the Eskimo–Aleut language group, spoken in western and southwestern Alaska. Both in ethnic population and in number of speakers, the Central Alaskan Yupik people form the largest group among Alaska Natives. As of 2010 Yupʼik was, after Navajo, the second most spoken aboriginal language in the United States. Yupʼik should not be confused with the related language Central Siberian Yupik spoken in Chukotka and St. Lawrence Island, nor Naukan Yupik likewise spoken in Chukotka.