| Classification | Independent (1887, 1889, 1898) Class D (1908–1916, 1936–1941, 1944–1947) |
|---|---|
| Sport | Minor League Baseball |
| First season | 1887 |
| Ceased | 1947 |
| Replaced by | Ohio–Indiana League |
| Director | L. A. Moore (1887) |
| President | George Clugston (1887) Charles Voegle (1887) D.A. Nichols (1889) George Hammond (1898) Robert Quinn (1908–1909) Robert W. Read (1910–1914) Joseph T. Carr (1915–1916) Harry Smith (1908–1909) Paul H. Shank (1938–1940) Joe Donnelly (1941, 1944) Frank M. Colley (1945–1947) |
| No. of teams | 41 |
| Country | United States of America |
| Most titles | 5 Portsmouth Cobblers/Truckers |
| Related competitions | Tri-State League |
The Ohio State League was a minor league baseball league that operated in numerous seasons between 1887 and 1947, predominantly as a Class D level league. League franchises were based in Indiana, Kentucky, Michigan, Ohio and West Virginia.