Central Alaskan Yupʼik (also rendered Yupik, Central Yupik, or indigenously Yugtun) 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.

Yupʼik, like all Eskimo languages, is polysynthetic and uses suffixation as primary means for word formation. There are a great number of derivational suffixes (termed postbases) that are used productively to form these polysynthetic words. Yupʼik has predominantly ergative alignment: case marking follows the ergative pattern for the most part, but verb agreement can follow an ergative or an accusative pattern, depending on grammatical mood. The language grammatically distinguishes three numbers: singular, dual, and plural. There is no marking of grammatical gender in the language, nor are there articles.

The Yup'ik language goes by various names. Since it is a geographically central member of the Yupik languages and is spoken in Alaska, the language is often referred to as Central Alaskan Yupik (for example, in Miyaoka's 2012 grammar of the language). The term Yup'ik [jupːik] is a common endonym, and is derived from /juɣ-piɣ/ "person-genuine". The Alaska Native Language Center and Jacobson's (1995) learner's grammar use Central (Alaskan) Yup'ik, which can be seen as a hybrid of the former two terms; there is, however, potential for confusion here: Central (Alaskan) Yup'ik may refer to either the language as a whole, or the geographically central dialect of the language, more commonly called General Central Yup'ik.

Other endonyms are used regionally: Cup'ig in the Nunivak dialect, Cup'ik in Chevak (these terms are cognate with Yup'ik, but represent the pronunciation of the word in the respective dialect), and Yugtun in the Yukon-Kuskokwim region.

Yupʼik is spoken primarily in southwestern Alaska, from Norton Sound in the north to the Alaska Peninsula in the south, and from Lake Iliamna in the east to Nunivak Island in the west. Yup'ik lies geographically central relative to the other members of the Yupik language family: Alutiiq ~ Sugpiaq is spoken to south and east, and Central Siberian Yupik is spoken to the west on St. Lawrence Island (often called St. Lawrence Island Yupik in the Alaskan context) and on the Chukotka peninsula, where Naukan Yupik is also spoken. Yup'ik is bordered to the north by the more distantly related Iñupiaq language; the difference between Yupʼik and Iñupiaq is comparable to that of the difference between Spanish and French.

Of a total population of more than 23,000 people, more than 14,000 are speakers of the language. Children still grow up speaking Yupʼik as their first language in 17 of 68 Yupʼik villages, those mainly located on the lower Kuskokwim River, on Nelson Island, and along the coast between the Kuskokwim River and Nelson Island. The variety of Yup'ik spoken by the younger generations is being influenced strongly by English: it is less synthetic, has a reduced inventory of spatial demonstratives, and is lexically Anglicized.

Yup'ik is typically considered to have five dialects: Norton Sound, General Central Yup'ik, Nunivak, Hooper Bay-Chevak, and the extinct Egegik dialect. All extant dialects of the language are mutually intelligible, albeit with phonological and lexical differences that sometimes cause difficulty in cross-dialectal comprehension. Lexical differences exist somewhat dramatically across dialects, in part due to a historical practice of name taboo. Speakers may be reluctant to take on the lexicon of another dialect because they "often feel proud of their own dialects".

The Yupʼik dialects, sub-dialects and their locations are as follows: