| State: | OH |
| Type: | SR |
| Route: | 775 |
| Map: | OH 775 map.svg |
| Length Mi: | 35.26 |
| Length Ref: | [1] |
| Established: | 1937 |
| Direction A: | South |
| Terminus A: | near Proctorville |
| Junction: | in Proctorville |
| Direction B: | North |
| Terminus B: | near Gallipolis |
| Counties: | Lawrence, Gallia |
| Previous Type: | SR |
| Previous Route: | 774 |
| Next Type: | SR |
| Next Route: | 776 |
State Route 775 (SR 775) is a 31.49adj=midNaNadj=mid north - south state route in the southern portion of the U.S. state of Ohio. Its southern terminus is on the East Huntington Bridge with the unmarked West Virginia Route 106 south of Proctorville, and its northern terminus is at SR 141 nearly 7miles west of Gallipolis. Most of the route is a rural two-lane highway and passes through woodland. The same of its path, SR 775, passing through the Wayne National Forest. The route was commissioned in the mid-1930s and the highway was paved by the late 1950s. The route was extended in the mid-2000s, to its current southern terminus.
SR 775 begins on the East Huntington Bridge over the Ohio River at the West Virginia state line. Here, SR 775 has its highest traffic counts; the road has an average annual daily traffic (AADT) of 18,520 vehicles based on a 2012 Ohio Department of Transportation (ODOT) survey. The route heads north leaving the bridge and having an intersection with SR 7. SR 775 and SR 7 head northeasterly concurrent leaving Proctorville. The road passes near commercial and residential properties, as a three-lane highway, two-lane northbound and one-lane southbound. The highway has a traffic signal with Lawrence County Road 430 (CR 430), before becoming a two-lane highway. North of CR 403, the highway passes near residential properties and some woodland. In rural Lawrence County, SR 775 leaves SR 7 and heads towards the north-northwest. The route passes through woodland, with some houses, as a two-lane highway. The highway has a brief concurrency with SR 217, before entering the Wayne National Forest. The highway has an intersection with SR 141, at this intersection SR 775 turns northeasterly. North of SR 141, the AADT of SR 775 drops to 200 vehicles. The road has a T-intersection with SR 790, before turning towards the northwest and entering Gallia County. In Gallia County the highway begins to curve the north, before curving to the northeast. SR 775 has its northern terminus at a T-intersection with SR 141, in the Wayne National Forest. The only section of highway that is concurrent with SR 7 is incorporated within the National Highway System (NHS).
SR 775 was commissioned in 1937 on the same route as today. The entire route was paved by 1959. The route was extended to the East Huntington Bridge in 2006, concurrent with SR 7 and replacing SR 607.