M-114 was the designation of a former state trunkline highway and planned beltline in the US state of Michigan around the city of Grand Rapids. It was designated by the end of 1929 on various streets in adjoining cities and townships. By the 1940s, sections of it on the west and south sides of Grand Rapids were given new designations and the segment along the east side of town was finished. By late 1945 the highway designation was completely decommissioned in favor of other numbers. M-114 split into two branches, one running east–west and the other running north–south. The east–west spur routing is now local streets while the rest is part of state highways.