Ohio State Route 108

State Route 108
Route information
Maintained by ODOT
Length	49.21 mi[1] (79.20 km)
Existed	1938–present
Major junctions
South end	SR 15 south of Miller City
Major intersections	US 6 / US 24 in Napoleon US 20A / SR 2 in Wauseon I-80 / I-90 / Ohio Turnpike near Wauseon US 20 / CR 18 near Lyons
North end	M-156 in Morenci, MI
Location
Country	United States
State	Ohio
Counties	Putnam, Henry, Fulton
Highway system
Ohio State Highway System Interstate US State Scenic
← SR 107 → SR 109
← US 33 → SR 34

State Route 108 (SR 108) is a 49.30-mile (79.34 km) state route that runs between SR 15 and the Michigan state line in the US state of Ohio. Most of the route is a rural two-lane highway and passes through both farmland and residential properties.

The highway was first signed in 1938 on much the same alignment as today. SR 108 replaced the SR 33 and SR 188 designation of the highway which dated back to 1923. SR 188 ran between Ottawa and Holgate and SR 33 ran between Holgate and the Michigan state line. Some of the highway was paved in 1923, with the rest of the route being paved in 1929.