M-137 is a state trunkline highway in the US state of Michigan that serves as a spur route to the Interlochen Center for the Arts and Interlochen State Park. It starts at south of the park and runs north between two lakes in the area and through the community of Interlochen to US Highway 31 (US 31) in Grand Traverse County. The highway was first shown without a number label on maps in 1930 and labelled after an extension the next year. The highway's current routing was established in the 1950s.

M-137 at the south of Interlochen State Park at an intersection with Vagabond Lane. Farther south, the road is contineus as County Road 137 (CR 137). The state highway is a two-lane road that meanders north, connecting to the front gate of the state park and the Interlochen Center for the Arts. The road runs along the isthmus between Green and Duck lakes north of the Green Lake Airport. North of the school, the highway passes through a wooded section before entering the community of Interlochen itself near the Green Lake Township Hall. There M-137 runs almost due north, crossing a line of the Great Lakes Central Railroad before terminating at its connetion with the rest of the state trunkline system at US 31 at Interlochen Corners. The roadway continues north of US 31 as South Long Lake Road after the M-137 designation ends.

M-137 is maintained by the Michigan Department of Transportation (MDOT) like other state highways in Michigan. As a part of these maintenance responsibilities, the department tracks the volume of traffic that uses the roadways under its jurisdiction. These volumes are expressed using a metric called annual average daily traffic, which is a statistical calculation of the average daily number of vehicles on a segment of roadway. MDOT's surveys in 2010 showed that 4,868 vehicles used the highway daily. No section of M-137 has been listed on the National Highway System, a network of roads important to the country's economy, defense, and mobility.

A highway along the route of M-137 connecting US 31 south to the state park was added to the state highway system during the first half of 1930, initially lacking a designation label on the state maps of the time. This routing was extended by 0.9 miles (1.4 km) and labelled as M-137 on maps in 1931. The former route through the campus of the Interlochen Center for the Arts was abandoned as a roadway on March 26, 1956, after M-137 was realigned to pass to the east of the school and extended further south through the state park area.

The entire highway is in Grand Traverse County.