Esta es una lista de las temporadas de la Liga de Hockey de Ontario desde el inicio de la liga, así como una lista de las temporadas de sus ligas precursoras, la Liga Mayor de Hockey Juvenil de Ontario (OMJHL) y la Liga Juvenil A de la Asociación de Hockey de Ontario (OHA).
1933–34 | 1934–35 | 1935–36 | 1936–37 | 1937–38 | 1938–39 | 1939–40 | 1940–41 | 1941–42 | 1942–43 | 1943–44 | 1944–45 | 1945–46 | 1946–47 | 1947–48 | 1948–49 | 1949–50 | 1950–51 | 1951–52 | 1952–53 | 1953–54 | 1954–55 | 1955–56 | 1956–57 | 1957–58 | 1958–59 | 1959–60 | 1960–61 | 1961–62 | 1962–63 | 1963–64 | 1964–65 | 1965–66 | 1966–67 | 1967–68 | 1968–69 | 1969–70 | 1970–71 | 1971–72 | 1972–73 | 1973–74
1974–75 | 1975–76 | 1976–77 | 1977–78 | 1978–79 | 1979–80
1980–81 | 1981–82 | 1982–83 | 1983–84 | 1984–85 | 1985–86 | 1986–87 | 1987–88 | 1988–89 | 1989–90 | 1990–91 | 1991–92 | 1992–93 | 1993–94 | 1994–95 | 1995–96 | 1996–97 | 1997–98 | 1998–99 | 1999–00 | 2000–01 | 2001–02 | 2002-03 | 2003–04 | 2004-05 | 2005–06 | 2006-07 | 2007–08 | 2008-09 | 2009-10 | 2010-11 | 2011-12 | 2012-13 | 2013-14 | 2014-15 | 2015-16 | 2016-17 | 2017-18 | 2018-19 | 2019-20 | 2020-21 | 2021-22 | 2022-23 | 2023-24 | 2024-25 |