This is a list of seasons for the Ottawa-St. Lawrence Conference.
* League formed with Loyola, McGill II, RMC, Bishop's, SGWU, Carleton, and MacDonald College.
- 1949-50 OSLC Season
- 1950-51 OSLC Season
- 1951-52 OSLC Season * Queen's joined, SGWU, Carleton, and MacDonald left.
- 1952-53 OSLC Season * SGWU and Carleton re-entered.
- 1953-54 OSLC Season * College Militaire Royale joined
- 1954-55 OSLC Season * records missing for 1954-55 to 1958-59
- 1955-56 OSLC Season * records missing for 1954-55 to 1958-59
- 1956-57 OSLC Season * records missing for 1954-55 to 1958-59
- 1957-58 OSLC Season * records missing for 1954-55 to 1958-59
- 1958-59 OSLC Season * records missing for 1954-55 to 1958-59
- 1959-60 OSLC Season * MacDonald joined, McGill II, Carleton, and Queen's left
- 1960-61 OSLC Season * records missing for 1960-61
- 1961-62 OSLC Season * Ottawa and Carleton joined
- 1962-63 OSLC Season * Sherbrooke joined, College Militaire Royale left
- 1963-64 OSLC Season
- 1964-65 OSLC Season
- 1965-66 OSLC Season * College Militaire Royale joined
- 1966-67 OSLC Season * St. Patrick's College joined
- 1967-68 OSLC Season * St. Patrick's College merged with Carleton
- 1968-69 OSLC Season * Ottawa and Carleton left
- 1969-70 OSLC Season * UQTR joined and College Militaire Royale left
- 1970-71 OSLC Season
NOTE: In 1971-72 the remaining teams in the OSLC other than MacDonald College joined the QUAA.