Yooper is a form of North Central American English mostly spoken in the Upper Peninsula of Michigan, which gives the dialect its name (from "U.P." for Upper Peninsula). The dialect is also found in many northern areas of the Lower Peninsula of Michigan and largely in Northeast Wisconsin.

Yooper differs from standard English primarily because of the linguistic background of settlers to the area. The majority of people living in the Upper Peninsula are of either Finnish, French Canadian, Flemish, Scandinavian, German, or Native American descent. Yooper is so massively influenced by these areas' languages that speakers from other areas may have difficulty understanding it. The Yooper dialect is also influenced by the Finnish language making it similar in character to the so-called "Rayncher speek" of the Mesabi Iron Range in northeast Minnesota.

Although these features are found in the UP, they are primarily in the western UP, and not all residents use these features. Equally important is the fact that many of these features are found throughout the upper midwest, especially in northern Wisconsin and northern Minnesota.