Petoskey is a city in the U.S. state of Michigan. As of the 2000 census, the city population was 6,080. It is the county seat of Emmet County 6 .

Petoskey and the surrounding area are notable for being the setting of several of the Nick Adams stories by Ernest Hemingway, who spent his childhood summers on nearby Walloon Lake, as well as being the place, where for Calliope the protagonist of Jeffrey Eugenides' "Middlesex", life takes a severe and lasting turn. Petoskey is famous for a high concentration of Petoskey stones, the state stone of Michigan. Petoskey is the birthplace of Information Theorist Claude Shannon and Civil War Historian Bruce Catton and is the boyhood home of singer/songwriter Sufjan Stevens. "Petoskey" is said to mean "where the light shines through the clouds" in the language of the Ottawa (tribe) Indians (Little Traverse Bay Band) who are the original inhabitants. But verifiable is that The Petoskey stone and the city were named after Chief Ignatius Petosega(1787-1885) who founded the community. Petoskey's father was a French fur trader and his mother was an Odawa (Ottawa) Indian.

This city was the northern terminus of the Chicago and West Michigan Railway.