State Route 739 (SR 739) is a 35.50-mile (57.13 km) long north–south state highway in the central portion of the U.S. state of Ohio. The route's southern terminus is at an interchange with U.S. Route 33 (US 33) nearly 5.25 miles (8.45 km) northeast of North Lewisburg at an interchange that doubles as the eastern terminus of SR 287. The northern terminus of SR 739 is near downtown Marion, where it meets SR 4 and SR 423.