State Route 694 (SR 694) is a 12-mile-long (19 km) Ohio State Route that runs between the Auglaize River and Glandorf in the US state of Ohio. None of the highway is listed on the National Highway System. Most of the route is a rural two-lane highway and passes through farmland properties. SR 694 was first signed in 1937 on much of the same alignment as today. The highway was paved in 1950.

SR 694 begins at an intersection with SR 114 on the bank of the Auglaize River. The route heads north as a two-lane highway, passing through woodland and farmland. The road turns due east passing through farmland, with some houses. The highway has an intersection with SR 115 in rural Putnam County. East of the intersection the route passes a golf course and a few houses, before returning to passing mostly farmland. SR 694 curves northeast and enters the village of Glandorf. The road turns southeast and passes through industrial and residential properties. The route curves due some and has an intersection at U.S. Route 224 (US 224). This intersection is the eastern terminus of SR 694.

There is no section of SR 694 that is included as a part of the National Highway System, a system of routes determined to be the most important for the nation's economy, mobility and defense. The highway is maintained by the Ohio Department of Transportation (ODOT) like all other state routes in the state. The department tracks the traffic volumes along all state highways as a part of its maintenance responsibilities using a metric called average annual daily traffic (AADT). This measurement is a calculation of the traffic level along a segment of roadway for any average day of the year. In 2011, ODOT figured that the lowest traffic levels were present on the section that is between SR 114 and SR 115, where only 650 vehicles used the highway daily. The peak traffic volume was 3,710 vehicles AADT along a section of SR 694 near its eastern terminus.

SR 694 made its debut in 1937 along the path that it occupies to this day. In 1950 the entire route was paved. No changes of major significance have occurred to the routing of the highway since 1950.

The entire route is in Putnam County.