Leslie is a city in Ingham County in the U.S. state of Michigan. The population was 1,851 at the 2010 census. The city is surrounded by Leslie Township, but the two are administered autonomously.

Ingham County is a county located in the U.S. state of Michigan. As of the 2020 Census, the population was 284,900. The county seat is Mason. Lansing, the state capital of Michigan, is largely located within the county. Lansing is the only state capital in the United States located in a county of which it is not also the seat of government. The county is home to Michigan State University, Lansing Community College, and the Class A minor league baseball team Lansing Lugnuts. Ingham County is included in the Lansing–East Lansing, MI Metropolitan Statistical Area. It is considered to be a part of Mid Michigan.