This is a list of the seasons of the Ontario Hockey Association's Junior A series:
- 1933-34 OHA Junior A Season
- 1934-35 OHA Junior A Season
- 1935-36 OHA Junior A Season
- 1936-37 OHA Junior A Season
- 1937-38 OHA Junior A Season
- 1938-39 OHA Junior A Season
- 1939-40 OHA Junior A Season
- 1940-41 OHA Junior A Season
- 1941-42 OHA Junior A Season
- 1942-43 OHA Junior A Season
- 1943-44 OHA Junior A Season
- 1944-45 OHA Junior A Season
- 1945-46 OHA Junior A Season
- 1946-47 OHA Junior A Season
- 1947-48 OHA Junior A Season
- 1948-49 OHA Junior A Season
- 1949-50 OHA Junior A Season
- 1950-51 OHA Junior A Season
- 1951-52 OHA Junior A Season
- 1952-53 OHA Junior A Season
- 1953-54 OHA Junior A Season
- 1954-55 OHA Junior A Season
- 1955-56 OHA Junior A Season
- 1956-57 OHA Junior A Season
- 1957-58 OHA Junior A Season
- 1958-59 OHA Junior A Season
- 1959-60 OHA Junior A Season
- 1960-61 OHA Junior A Season
- 1961-62 MTJAHL
- 1961-62 OHA Junior A Season
- 1962-63 MTJAHL
- 1962-63 OHA Junior A Season
- 1963-64 OHA Junior A Season
- 1964-65 OHA Junior A Season
- 1965-66 OHA Junior A Season
- 1966-67 OHA Junior A Season
- 1967-68 OHA Junior A Season
- 1968-69 OHA Junior A Season
- 1969-70 OHA Junior A Season
Note: The junior series was divided into "A" and "B" sections in 1933. Prior to this year there was just one junior series. See List of OHA Junior Seasons for seasons before 1933.