State Route 370 (SR 370, OH 370) is 1.21-mile (1.95 km) long north–south state highway in the western part of the U.S. state of Ohio. The highway runs from its southern terminus at the main entrance to John Bryan State Park nearly 2 miles (3.2 km) southeast of Yellow Springs to its northern terminus at SR 343 about 0.75 miles (1.21 km) east of Yellow Springs.

SR 370 was established in the middle of the 1930s. A spur route, its primary function is to connect John Bryan State Park to the state highway system. This two-lane highway is located in the northern portion of Greene County.

The entire 1.21-mile (1.95 km) length of SR 370 exists within the boundaries of Miami Township in northern Greene County. The highway begins at the main entrance to John Bryan State Park nearly 2 miles (3.2 km) southeast of Yellow Springs. As it travels to the north, SR 370 passes amidst a blend of open fields and woods, with a number of houses appearing alongside the highway. It arrives at its northern terminus where it intersects SR 343.

Maintenance of SR 370 is done by the Ohio Department of Transportation. Part of the organization's responsibilities in maintaining this highway and others in the state highway system is measuring the amount of traffic that utilizes the route. This is done using a metric called the annual average daily traffic (AADT). The AADT refers to the volume of traffic traveling along a given stretch of highway on a typical day of the year. According to a 2008 survey, an average of 250 passenger vehicles and 10 commercial vehicles travel the length of SR 370 on a daily basis. This route is not included as a part of the National Highway System (NHS). The NHS is a network of highways identified as being most important for the economy, mobility and defense of the nation.

SR 370 was established in 1934. Throughout its history, SR 370 has served as a spur route off of SR 343 that provides access to John Bryan State Park. When it was first designated, the entirety of the route was a gravel roadway. The highway was paved by 1941. Since that time, the route has not experienced any changes of major significance.

The entire route is in Miami Township, Greene County.