| Early Groupings (1933–1950) |
| Year |
Champion |
Finalist |
Semi-finalist(s) |
| 1934 |
St. Michael's Buzzers (Gr 5) |
Preston Riverside (Gr 8) |
Hagersville (Gr 10), Peterborough (Gr 2) |
| 1935 |
Barrie Colts |
St. Michael's Buzzers |
Niagara Falls, Peterborough |
| 1936 |
St. Michael's Buzzers |
Guelph Maple Leafs |
Assumption, Kingston |
| 1937 |
Northern Vocational |
Barrie Colts |
Guelph, Niagara Falls |
| 1938 |
Kingston Indians (Gr 1) |
Barrie Colts (Gr 15) |
Brantford (Gr 11), Northern (Gr 5) |
| 1939 |
Niagara Falls Good Cheer (Gr 5) |
Kitchener Greenshirts (Gr 6) |
Oshawa (Gr 2), Runnymede (Gr 3) |
| 1940 |
Waterloo Siskins |
Owen Sound Greys |
Aurora Bears (Gr 5) |
| 1941 |
Brantford Lions (Gr 5) |
Oshawa Bees (Gr 3) |
Owen Sound (Gr 8), St. Catharines (Gr 6) |
| 1942 |
Stratford Canadians (Gr 5) |
Hamilton Aerovox (Gr 4) |
Owen Sound (Gr 7), U of Toronto (Gr 3) |
| 1943 |
Port Colborne Recreationists |
Milton Tigers (TGr) |
U of Toronto (PSG), Windsor |
| 1944 |
De La Salle Academy |
Barrie Colts |
Kingston, Kitchener |
| 1945 |
St. Michael's Buzzers (PSG) |
Stratford Kroehlers (Gr 9) |
Oshawa, Windsor |
| 1946 |
De La Salle Academy (Gr 3) |
Kitchener Greenshirts (Gr 5) |
Scarborough (Gr 2), Waterloo (Gr 6) |
| 1947 |
De La Salle Academy (TGr3) |
Hamilton Aerovox (Gr 6) |
Port Colborne (Gr 8), Toronto (TGr2) |
| 1948 |
Hamilton Aerovox (Gr 7) |
St. Michael's Buzzers (TGr4) |
Upper Canada College (TGr5) |
| 1949 |
Kitchener Greenshirts (CGr) |
Upper Canada Collegians (PSG) |
North Toronto (TGr2), Toronto (TGr1) |
| 1950 |
Barrie Colts (GB) |
Guelph Biltmores (WGr) |
Toronto Carwill Transport (T) |
| Formation of Leagues (1950–1969) |
| Year |
Champion |
Finalist |
Semi-finalist(s) |
| 1951 |
Sarnia Jr. Sailors (W) |
Weston Dukes (Met) |
Kingston (E), Kitchener (WGr) |
| 1952 |
Weston Dukes (Met) |
Waterloo Siskins (WGr) |
Belleville (E), Hamilton (ND) |
| 1953 |
Weston Dukes (Met) |
Waterloo Siskins (WGr) |
Belleville (E), Seaforth (W) |
| 1954 |
Waterloo Siskins (WGr) |
Weston Dukes (Met) |
Kingston Vics (E) |
| 1955 |
Woodstock Warriors (C) |
Woodbridge Dodgers (Met) |
Peterborough (E), Seaforth (W) |
| 1956 |
Waterloo Siskins (C) |
Brampton Regents (Met) |
Kingston Vics (E) |
| 1957 |
Dixie Beehives (Met) |
Sarnia Legionnaires (W) |
Burlington (C), Peterborough (E) |
| 1958 |
Sarnia Legionnaires (W) |
Lakeshore Bruins (Met) |
Burlington (C), Peterborough (E) |
| 1959 |
Sarnia Legionnaires (W) |
Aurora Bears (Met) |
St. Catharines (ND), Waterloo (C) |
| 1960 |
Waterloo Siskins (C) |
Toronto Marlboros (Met) |
Chatham (BC), Peterborough (E) |
| 1961 |
St. Michael's Buzzers (Met) |
Owen Sound Greys (C) |
Peterborough (E), St. Marys |
| 1962 |
Waterloo Siskins (C) |
St. Thomas Barons (W) |
Belleville (E), Chatham (BC) |
| 1963 |
St. Marys Lincolns (W) |
Kingston Frontenacs (E) |
Burlington (ND), Detroit (BC) |
| 1964 |
Waterloo Siskins (C) |
Weston Dodgers (Met) |
Kingston (E), London (W) |
| 1965 |
Kitchener Greenshirts (C) |
Etobicoke Indians (Met) |
Hamilton (ND), London (W) |
| 1966 |
Sarnia Legionnaires (W) |
Westclair York Steelers (Met) |
Hamilton (ND), Oshawa (E) |
| 1967 |
Kitchener Greenshirts (C) |
Dixie Beehives (Met) |
Peterborough (E), Stamford (ND) |
| 1968 |
Sarnia Legionnaires (W) |
Markham Seal-A-Wax (Met) |
Oshawa (E), St. Marys (C) |
| 1969 |
Markham Seal-A-Wax (Met) |
Strathroy Rockets (C) |
Hamilton (ND), Oshawa (E) |
| League Expansion Era (1969–1979) |
| Year |
Champion |
Finalist |
Semi-finalist(s) |
| 1970 |
Dixie Beehives (Met) |
Hamilton Mountain Bees (ND) |
Kingston (E), Stratford (WO) |
| 1971 |
Dixie Beehives (Met) |
Hamilton Mountain Bees (ND) |
Peterborough (E), Petrolia (BC) |
| 1972 |
Markham Waxers (Met) |
St. Marys Lincolns (WO) |
Peterborough (E), St. Catharines (ND) |
| 1973 |
Sarnia Bees (WO) |
Toronto Nationals (Met) |
Hamilton (ND), Owen Sound (MO) |
| 1974 |
Hamilton Red Wings (ND) |
Bramalea Blues (Met) |
Owen Sound (MO), Sarnia (WO) |
| 1975 |
Bramalea Blues (Met) |
Oakville Blades (C) |
|
| 1976 |
St. Marys Lincolns (WO) |
Collingwood Blues (MO) |
Belleville (Met), Streetsville (C) |
| 1977 |
Stratford Cullitons (WW) |
Streetsville Derbys (C) |
St. Catharines (GH), Seneca (Met) |
| 1978 |
Stratford Cullitons (MW) |
Streetsville Derbys (C) |
Oshawa (Met), Windsor (WO) |
| 1979 |
Streetsville Derbys (C) |
St. Catharines Falcons (GH) |
Oshawa (Met), Windsor (WO) |
| 4- and 5-League Eras (1979–1993) |
| Year |
Champion |
Finalist |
Semi-finalist(s) |
| 1980 |
Belleville Bobcats (Met) |
Windsor Bulldogs (WO) |
Streetsville Derbys (C) |
| 1981 |
Burlington Cougars (C) |
Stratford Cullitons (MW) |
St. Catharines (GH), St. Michael's (Met) |
| 1982 |
St. Michael's Buzzers (Met) |
Sarnia Bees (WO) |
Oakville Blades (C) |
| 1983 |
Henry Carr Crusaders (Met) |
Stratford Cullitons (MW) |
London (WO), Streetsville (C) |
| 1984 |
Waterloo Siskins (MW) |
Streetsville Derbys (C) |
Oshawa Legionaires (Met) |
| 1985 |
Waterloo Siskins (MW) |
Bramalea Blues (Met) |
Barrie Colts (C) |
| 1986 |
Stratford Cullitons (MW) |
Streetsville Derbys (C) |
Pickering (Met), St. Thomas (WO) |
| 1987 |
St. Thomas Stars (WO) |
Niagara Falls Devils (GH) |
Burlington Cougars (C) |
| 1988 |
Waterloo Siskins (MW) |
Bramalea Blues (Met) |
Barrie (C), Niagara Falls (GH) |
| 1989 |
St. Michael's Buzzers (Met) |
Niagara Falls Devils (GH) |
Barrie (C), Sarnia (WO) |
| 1990 |
Stratford Cullitons (MW) |
St. Catharines Falcons (GH) |
Barrie (C), Chatham (WO) |
| 1991 |
Waterloo Siskins (MW) |
Oakville Blades (C) |
Chatham (WO), Welland (GH) |
| 1992 |
Kitchener Dutchmen (MW) |
Milton Merchants (C) |
London (WO), St. Catharines (GH) |
| 1993 |
Barrie Colts (C) |
Kitchener Dutchmen (MW) |
Hamilton (GH), Sarnia (WO) |
| 3-League Era (1993–2007) |
| Year |
Champion |
Finalist |
RR Finalist |
| 1994 |
Waterloo Siskins (MW) |
St. Catharines Falcons (GH) |
St. Marys Lincolns (WO) |
| 1995 |
Stratford Cullitons (MW) |
St. Thomas Stars (WO) |
Niagara Falls Canucks (GH) |
| 1996 |
Niagara Falls Canucks (GH) |
St. Thomas Stars (WO) |
Stratford Cullitons (MW) |
| 1997 |
Elmira Sugar Kings (MW) |
St. Catharines Falcons (GH) |
Strathroy Rockets (WO) |
| 1998 |
Niagara Falls Canucks (GH) |
Elmira Sugar Kings (MW) |
Chatham Maroons (WO) |
| 1999 |
Chatham Maroons (WO) |
Stratford Cullitons (MW) |
St. Catharines Falcons (GH) |
| 2000 |
Cambridge Winterhawks (MW) |
St. Catharines Falcons (GH) |
Chatham Maroons (WO) |
| 2001 |
Elmira Sugar Kings (MW) |
Thorold Blackhawks (GH) |
Chatham Maroons (WO) |
| 2002 |
Sarnia Blast (WO) |
Elmira Sugar Kings (MW) |
Niagara Falls Canucks (GH) |
| 2003 |
Stratford Cullitons (MW) |
Thorold Blackhawks (GH) |
Petrolia Jets (WO) |
| 2004 |
Stratford Cullitons (MW) |
Thorold Blackhawks (GH) |
Chatham Maroons (WO) |
| 2005 |
Thorold Blackhawks (GH) |
Chatham Maroons (WO) |
Listowel Cyclones (MW) |
| 2006 |
Cambridge Winterhawks (MW) |
Niagara Falls Canucks (GH) |
Chatham Maroons (WO) |
| 2007 |
Cambridge Winterhawks (MW) |
Strathroy Rockets (WO) |
St. Catharines Falcons (GH) |
| Greater Ontario Junior Hockey League (2007–Present) |
| Year |
Champion |
Finalist |
RR Finalist |
| 2008 |
Tecumseh Chiefs (WOC) |
Elmira Sugar Kings (MWC) |
Thorold Blackhawks (GHC) |
| 2009 |
Brantford Eagles (MWC) |
Stoney Creek Warriors (GHC) |
Sarnia Legionnaires (WOC) |
| 2010 |
LaSalle Vipers (WOC) |
Brantford Eagles (MWC) |
Stoney Creek Warriors (GHC) |
| 2011 |
Elmira Sugar Kings (MWC) |
Niagara Falls Canucks (GHC) |
St. Thomas Stars (WOC) |
| 2012 |
St. Catharines Falcons (GHC) |
Brantford Eagles (MWC) |
London Nationals (WOC) |
| 2013 |
London Nationals (WOC) |
Cambridge Winter Hawks (MWC) |
St. Catharines Falcons (GHC) |