M-87 is the designation of a former state trunkline highway in the Lower Peninsula of the US state of Michigan, which prior to 1960 ran east–west between the towns of Fenton and Holly. The highway served as a connector between US Highway 23 (US 23) and the former routing of US 10, which ran along what is now the Interstate 75 (I-75) corridor. The highway connected the downtown areas of each community as well as running through then-rural areas of Genesee and Oakland counties. The trunkline was decommissioned in late 1960, removing it from the system.