The Upper Peninsula is the northern of the two major peninsulas that make up the U.S. state of Michigan. It may also be referred to as the UP or Upper Michigan. The peninsula is bounded on the north by Lake Superior, on the east by the St. Marys River, on the southeast by Lake Michigan and Lake Huron, and on the southwest by Wisconsin.

The Upper Peninsula contains 29% of the land area of Michigan but just 3% of its total population. Residents are frequently called Yoopers (derived from "U.P.-ers") and have a strong regional identity. Large numbers of French Canadian, Finnish, Swedish, Cornish, and Italian immigrants came to the Upper Peninsula, especially the Keweenaw Peninsula, to work in the area's lumber industry. The peninsula includes the only counties in the United States where a plurality of residents claim Finnish ancestry.

Thousands of Americans and immigrants moved to the area during the mining boom, prompting the federal government to create Fort Wilkins near Copper Harbor to maintain order. The first wave were the Cornish from England, with centuries of mining experience; followed by Irish, Germans, and French Canadians. During the 1890's, Finnish immigrants began settling there in large numbers, forming the population plurality in the northwestern half of the peninsula. In the early 20th century, 75% of the population was foreign-born.

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