M-156 is a state trunkline highway in the US state of Michigan. The highway is entirely within Lenawee County and begins in Morenci at the Ohio state line with State Route 108 (SR 108) and runs north to M-34 at Clayton. The highway runs through farm land along Lime Creek outside of the two communities, providing access to the Lake Hudson State Recreation Area. The trunkline dates back to the early 1930s, and has been unchanged since a realignment in 1980.