Ohio–Indiana League
| Formerly | Ohio State League |
|---|---|
| Classification | Class D (1907, 1948–1951) |
| Sport | Minor League Baseball |
| First season | 1907 |
| Ceased | 1951 |
| Replaced by | Indiana-Ohio League (1908) |
| President | Frank M. Colley (1948–1951) |
| No. of teams | 13 |
| Country | United States of America |
| Most titles | 3 Marion Red Sox (1949–1951) |
| Related competitions | Ohio State League |
The Ohio–Indiana League was a Class D level minor league baseball league that operated from 1948 to 1951. The league was composed of six teams from Ohio and two teams from Indiana. The Marion Red Sox won three consecutive league championships beginning in 1949. There was also a six–team Ohio–Indiana League that played the 1907 season.