Troy is a city in Oakland County, Michigan, United States. Its population was 87,294 at the 2020 U.S. census, making Troy the most populous city in the county and the 13th most-populous municipality in the state. Troy is a northern suburb of Metro Detroit, located about sixteen miles (25.7 km) northwest of downtown Detroit.

Troy was organized as a township in 1827, and sections of the township incorporated much later into the cities of Birmingham, Clawson, and Royal Oak. The remainder of the township incorporated as the present-day city of Troy in 1955.

Troy has become a business and shopping destination in the region, with numerous office centers and the upscale Somerset Collection mall. In 2011, Troy was ranked the safest city in Michigan and the 19th safest city in the United States. In 2008, Troy was ranked 22nd on a list of "Best Places to Live" in the United States by CNN Money, using criteria including housing, quality of education, economic strength, and recreational opportunities. In 2008, Troy was also ranked as the fourth most-affordable U.S. city with a median household income of approximately $79,000.