State Route 287 (SR 287, OH 287) is a 13.69-mile (22.03 km) long east–west state highway in the western portion of the U.S. state of Ohio. The western terminus of SR 287 is at SR 245 nearly 1.75 miles (2.82 km) east of West Liberty. Its eastern terminus is at an interchange with U.S. Route 33 (US 33) about 5.25 miles (8.45 km) northeast of North Lewisburg that dually serves as the southern terminus of SR 739.

This two-lane state route was created in the early 1930s. Until an extension in the late 1990s, SR 739 was entirely within Logan County. The extension into Union County was formerly part of U.S. Route 33.

Along its way, SR 287 passes through the southeastern quadrant of Logan County and the extreme western portion of Union County. No section of this state highway is included within National Highway System (NHS). The NHS is a network of routes that are identified as being most important for the economy, mobility and defense of the nation.

The debut of SR 287 took place in 1931. When it was inititally designated, it was routed along much of its current alignment from its western terminus at SR 245, at the time known as SR 275, to the T-intersection it has with the former two-lane alignment of US 33, now known as County Road 144 (CR 144), but originally designated as SR 32.

The highway would remain along this routing entirely within Logan County until 1999, when the freeway portion of US 33 was extended northwest from the Logan–Union County line to Bellefontaine. Consequently, the former two-lane portion of US 33 northwest of SR 287 was removed from the state highway system, and became known as CR 144. The portion southeast of that point became an extension of SR 287, which now followed the old routing of US 33 to the Stokes Road (CR 153) intersection, then turned northeast and followed Stokes Road a short distance to arrive at its present eastern terminus at a the interchange with the US 33 freeway that doubles as the southern terminus of SR 739.