| Champions | Runner-up | Result (Best of 7) |
| 2025 | Welland Jackfish | Barrie Baycats | 4-1 |
| 2024 | Barrie Baycats | Guelph Royals | 4-0 |
| 2023 | Welland Jackfish | Barrie Baycats | 4-2 |
| 2022 | London Majors | Toronto Maple Leafs | 4-2 |
| 2021 | London Majors | Toronto Maple Leafs | 3-2 |
| 2019 | Barrie Baycats | Kitchener Panthers | 4-2 |
| 2018 | Barrie Baycats | Kitchener Panthers | 4-2 |
| 2017 | Barrie Baycats | Kitchener Panthers | 4-0 |
| 2016 | Barrie Baycats | Toronto Maple Leafs | 4-0 |
| 2015 | Barrie Baycats | Kitchener Panthers | 4-1 |
| 2014 | Barrie Baycats | London Majors | 4-0 |
| 2013 | Brantford Red Sox | Barrie Baycats | 4-3 |
| 2012 | Brantford Red Sox | Barrie Baycats | 4-0 |
| 2011 | Brantford Red Sox | Ottawa Fat Cats | 4-1 |
| 2010 | Brantford Red Sox | Barrie Baycats | 4-2 |
| 2009 | Brantford Red Sox | Barrie Baycats | 4-0 |
| 2008 | Brantford Red Sox | London Majors | 4-3 |
| 2007 | Toronto Maple Leafs | Brantford Red Sox | 4-3 |
| 2006 | Brantford Red Sox | London Majors | 4-1 |
| 2005 | Barrie Baycats | Toronto Maple Leafs | 4-2 |
| 2004 | Guelph Royals | London Majors | 4-1 |
| 2003 | Guelph Royals | Brantford Red Sox | 4-3 |
| 2002 | Toronto Maple Leafs | Hamilton Cardinals | 4-1 |
| 2001 | Kitchener Panthers | Toronto Maple Leafs | 4-3 |
| 2000 | Kitchener Panthers | Guelph Royals | 4-1 |
| 1999 | Toronto Maple Leafs | Kitchener Panthers | 4-3 |
| 1998 | Kitchener Panthers | Toronto Maple Leafs | 4-3 |
| 1997 | Guelph Royals | Toronto Maple Leafs | 4-0 |
| 1996 | Kitchener Panthers | Toronto Maple Leafs | 4-2 |
| 1995 | Toronto Maple Leafs | Stratford Hillers | 4-3 |
| 1994 | Stratford Hillers | Guelph Royals | 4-3 |
| 1993 | Guelph Royals | Toronto Maple Leafs | 4-2 |
| 1992 | Stratford Hillers | Guelph Royals | 4-3 |
| 1991 | Stratford Hillers | Kitchener Panthers | 4-1 |
| 1990 | Kitchener Panthers | Brantford Red Sox | 4-1 |
| 1989 | Stratford Hillers | Toronto Maple Leafs | 4-0 |
| 1988 | Toronto Maple Leafs | Stratford Hillers | 4-3 |
| 1987 | Stratford Hillers | Niagara Falls Mariners | 4-0 |
| 1986 | Stratford Hillers | Toronto Maple Leafs | 4-2 |
| 1985 | Toronto Maple Leafs | St. Thomas Elgins | 4-1 |
| 1984 | St. Thomas Elgins | Toronto Maple Leafs | 4-1 |
| 1983 | Cambridge Terriers | Kitchener Panthers | 4-1 |
| 1982 | Toronto Maple Leafs | London Majors | 4-2 |
| 1981 | Brantford Red Sox | Kitchener Panthers | 4-2 |
| 1980 | Stratford Hillers | Brantford Red Sox | 4-2 |
| 1979 | Cambridge Terriers | Stratford Hillers | 4-0 |
| 1978 | Hamilton Cardinals | London Majors | 4-2 |
| 1977 | Stratford Hillers | Brantford Red Sox | 4-3 |
| 1976 | Stratford Hillers | London Majors | 4-3 |
| 1975 | London Majors | Guelph Forums | 4-2 |
| 1974 | Stratford Kraven Knits | Brantford Red Sox | 4-1 |
| 1973 | Kitchener-Waterloo Panthers | Stratford Kraven Knits | 4-2 |
| 1972 | Toronto Maple Leafs | Brantford Red Sox | 4-3 |
| 1971 | Kitchener-Waterloo Panthers | Guelph C-Joys | 4-0 |
| 1970 | Guelph C-Joys | Kitchener-Waterloo Panthers | 4-3 |
| 1969 | London Pontiacs | Stratford Hoods | 4-3 |
| 1968 | Kitchener-Waterloo Panthers | Hamilton Red Wings | 4-1 |
| 1967 | Kitchener-Waterloo Panthers | Guelph C-Joys | 4-0 |
| 1966 | Galt Terriers | London Pontiacs | 4-2 |
| 1965 | Brantford Red Sox | Guelph C-Joys | 4-2 |
| 1964 | Galt Terriers | London Pontiacs | 4-3 |
| 1963 | Brantford Red Sox | Kitchener-Waterloo Panthers | 4-3 |
| 1962 | Brantford Red Sox | Guelph Royals | 4-1 |
| 1961 | Brantford Red Sox | Kitchener-Waterloo Panthers |
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| 1960 | Brantford Red Sox | Hamilton Cardinals | 4-1 |
| 1959 | Brantford Red Sox | Galt Terriers | 4-1 |
| 1958 | St. Thomas Elgins | Galt Terriers | 4-3 |
| 1957 | Kitchener-Waterloo Dutchmen | Listowel Legionnaires | 4-3 |
| 1956 | London Majors | Oshawa Motors |
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| 1955 | St. Thomas Elgins | Oshawa Merchants | 4-1 |
| 1954 | St. Thomas Elgins | Galt Terriers |
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| 1953 | Kitchener Panthers | Waterloo Tigers | 5-3 |
| 1952 | Kitchener Panthers | Brantford Red Sox |
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| 1951 | London Majors | Brantford Red Sox |
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| 1950 | Waterloo Tigers | Brantford Red Sox |
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| 1949 | Brantford Red Sox | Waterloo Tigers | Best of Nine |
| 1948 | London Majors | Waterloo Tigers | 4-0 |
| 1947 | London Majors |
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| 1946 | Stratford Nationals | London Majors |
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| 1945 | London Majors |
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| 1944 | London Majors |
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| 1943 | London Army Team |
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| 1942 | Stratford Nationals |
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| 1941 | Waterloo Tigers |
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| 1940 | Stratford Nationals |
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| 1939 | Stratford Nationals | Brantford Red Sox |
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| 1938 | Stratford Nationals | London Seniors |
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| 1937 | London Silverwoods | Stratford Nationals |
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| 1936 | London Silverwoods | Brantford Red Sox |
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| 1935 | Galt Terriers | Stratford Nationals |
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| 1934 | Stratford Nationals | London Winery |
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| 1933 | St. Thomas Elgins | Guelph Maple Leafs |
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| 1932 | Guelph Maple Leafs | Twin City Panthers |
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| 1931 | Galt Terriers | Guelph Maple Leafs |
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| 1930 | Galt Terriers | Twin City Panthers |
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| 1929 | Galt Terriers | Twin City Panthers |
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| 1928 | Galt Terriers | St. Thomas Elgins |
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| 1927 | Galt Terriers | Guelph Maple Leafs |
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| 1926 | St. Thomas Elgins | Galt Terriers |
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| 1925 | London Cockneys | Preston |
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| 1924 | Galt Terriers | Guelph Maple Leafs |
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| 1923 | Galt Terriers | Guelph Maple Leafs |
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| 1922 | Galt Terriers | Guelph Maple Leafs |
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| 1921 | Guelph Maple Leafs | Galt Terriers |
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| 1920 | Guelph Maple Leafs | Galt Terriers |
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| 1919 | Guelph Maple Leafs | Galt Terriers |
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