Ohio State Route 81

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State Route 81 (SR 81) is a 70.5-mile east–west highway in western Ohio. It starts at the Indiana state line near Willshire, where the road continues as Indiana State Road 124, and ends at SR 53 in Patterson. The route passes near Elgin, Lima, Ada, and Dunkirk. It is maintained by the Ohio Department of Transportation and travels through Van Wert, Allen, and Hardin counties.

Major junctions include:
- West end: SR 124 near Willshire
- US 33 / SR 49 in Willshire
- US 127 near Rockford
- I-75 near Lima
- US 68 in Dunkirk
- East end: SR 53 in Patterson

History:
- SR 81 was certified by 1927.
- It originally ran from Ada to Patterson along the northern part of the former SR 69. When SR 69 was rerouted to Mount Cory (now part of SR 235), SR 81 kept its designation.
- In 1940, SR 81 was extended west to the Indiana line along unnumbered roads from Ada to Lima and along the former SR 704 from Lima to the state line.
- Since then, there have been no major changes.
- From 1923 to 1926, SR 81 existed as a short northeastern Ohio route between Brentwood Lake and Twinsburg; in 1926 it became part of SR 82.