State Route 689 (SR 689, OH 689) is a north–south state highway in the southern portion of the U.S. state of Ohio. Its southern terminus is at State Route 160 a mile north of Wilkesville, and its northern terminus is at State Route 32 about 6 miles (9.7 km) southwest of Albany.

State Route 689 passes through two counties along its path, Vinton and Meigs. This state highway is not included within the National Highway System.

State Route 689 first appeared in 1937 along the routing that it currently occupies. Other than the fact that the route intersecting State Route 689 at its northern terminus was designated as State Route 346 instead of State Route 32 at its inception, there have been no major changes to the routing of this state highway.