State Route 228 (SR 228, OH 228) is a short north–south state highway in the U.S. state of Ohio. The southern terminus of the state route is at State Route 19 nearly 5.5 miles (8.9 km) north of Republic. Its northern terminus is at State Route 101 approximately 5.5 miles (8.9 km) southwest of Clyde.

This state highway was established in the mid-1920s. It serves as a connector between State Route 19 and State Route 101 east and northeast of where the two routes intersect. State Route 19 jogs west from State Route 228's southern terminus, and State Route 101 traverses in a southwest-to-northeast fashion, creating a tight angle between the two routes. State Route 778 serves a similar purpose to State Route 228 to the west and southwest of the junction of State Route 19 and State Route 101.

State Route 228 is located entirely within Adams Township in Seneca County. It is not inclusive within the National Highway System.

This short connector route begins where State Route 19 and County Road 32 meet, an intersection in which State Route 19 forms the southern and western legs and County Road 32 approaches from the east. State Route 228 runs north from there, passing amidst farmland at first before going by a few homes and some clumps of trees, and them through more farmland. The highway then passes into some thicker woods as it bends to the northwest and passes an intersection with Township Road 178. Just after that point, State Route 228 arrives at its endpoint at the intersection of State Route 101 and Township Road 180, where State Route 101 crosses southwest-to-northeast, and Township Road 180 continues to the northwest after State Route 228 terminates.

State Route 228 came into being in 1924 along the routing that it occupies to this day. No significant changes have taken place to the highway since its debut.

The entire route is in Adams Township, Seneca County.