State Route 190 (SR 190, Ohio 190, OH 190) is a 8.93-mile (14.37 km) long north–south state highway in the western portion of the U.S. state of Ohio. The southern terminus of SR 190 is at an intersection with SR 66 in Delphos. Its northern terminus is at an intersection with US 224 approximately 4 miles (6.4 km) east of Ottoville.SR 190 designation was applied in the mid 1920s, to some of the same route as today, the rest was SR 106.