State Route 34 (SR 34) is an Ohio State Route that runs between Indiana State Road 427, west of Edon and US 6 (US 6) in the US state of Ohio. The 32.02 miles (51.53 km) of SR 34 that lie within the state serve as a minor highway. None of the highway is listed on the National Highway System. Various sections are rural two-lane highway and urban four-lane highway.