State Route 137 (SR-137) is a 11.357-mile-long (18.277 km) state highway in the state of Utah that connects the town of Mayfield with the city of Gunnison and U.S. Route 89 (US-89) in rural Sanpete County.

State Route 137 is configured as a loop of US-89,[3] with a short southern spur to service the center of Mayfield.

[1] It begins in Gunnison as 600 S at its intersection with Main Street (US-89), and travels eastward, turning southeast towards Mayfield as it passes the end of a mountain range.

[3] At about the 7-mile (11 km) mark, as the route enters Mayfield's town limits, the southern spur splits off and travels south along Main Street for about 0.5 miles (0.80 km).

[1] The main leg of the route turns north on State Street and continues the 3.7 miles (6.0 km) north to its terminus at US-89.