Ontario Rugby Football Union

For most of the first half of the 20th century, the ORFU was one of the stronger unions in Canada, and its champion was a frequent fixture in the Grey Cup even as the game became increasingly professionalized in the 1930s.

During World War II, the Ontario-based military teams played in the ORFU, filling the gap during the suspension of play by the Interprovincial Rugby Football Union. (Toronto Navy – H.M.C.S. York played out of Varsity Stadium, using the Toronto Argonauts' equipment and uniforms.) The Toronto RCAF Hurricanes were the last amateur team to win the Grey Cup in 1942. Many from the ranks of the military teams in the ORFU became stars in the CFL after the war.

With the return of peace, however, the ORFU found it increasingly difficult to compete in an environment dominated by the IRFU and the Western Interprovincial Football Union, which had both become fully professional. Indeed, by then it was the only fully amateur union still challenging for the Grey Cup. Even so, it retained enough prestige that it played the WIFU champion for a berth in the Grey Cup final. The IRFU was reluctant to accept the WIFU as a full equal even after it was clear that its quality of play had become the equal of the IRFU.

The ORFU withdrew from Grey Cup competition in 1954. Although the amateurs would not be formally locked out of Grey Cup play for another four years, this heralded the start of the modern era of Canadian football. The ORFU ceased to operate as a true senior league after 1960, but continued play at the intermediate level. Eventually the word "senior" came to replace the word "intermediate." By 1974, the ORFU had ceased to exist. However, the junior Ontario Rugby Football Union which was formed in 1890 lasted until the 1970 season.

• Toronto Football Club (1883–1895)
• Toronto Argonauts (1898–1906)
• Toronto Athletic Club (1896), Toronto Athletic Club-Lornes (1897)
• Hamilton Tigers 1883–1906, 1948–1949
• Ottawa Football Club (1883–1897), Ottawa Rough Riders (1898–1906)
• Ottawa College Football Club (1885–89, 1892-98)
• Kingston Granites (1899–1901)
• Hamilton Alerts – 1st Grey Cup Champions of the ORFU in 1912 (1911–1912, another team played by the name in 1940)
• Toronto Balmy Beach – 2 time Grey Cup Champions: 1927, 1930 (1924–1957)
• Sarnia Imperials – 2 time Grey Cup Champions: 1934, 1936 (1928–1955)
• Toronto Amateur Athletic Club – ORFU Champion 1908 & 1910
• Toronto Rugby and Athletic Association – ORFU Champion 1915, 1919 & 1920
• Hamilton (Flying) Wildcats – Grey Cup Champions: 1943 (1941–1947)
• Toronto Indians (1941–1948)
• Toronto RCAF Hurricanes – Grey Cup Champions: 1942 (1942–1943)
• Ottawa Trojans (1943–1947) ORFU Champion 1947
• Windsor Rockets (1945–50), Windsor Royals (1951–52)
• Brantford Redskins (1952–1953)
• Kitchener-Waterloo Dutchmen (1953–1959) ORFU Champion 1954–57
• London Lords (1956–1970)
• Sarnia Golden Bears ORFU Champion (1958–59)
• Bramalea Satellites (1967–1970)

The Imperial Oil Trophy was awarded to the league's most valuable player.

• 1934 Norm Perry - Sarnia Imperials
• 1935 Hugh "Bummer" Stirling - Sarnia Imperials
• 1936 Syd Reynolds - Toronto Balmy Beach Beachers
• 1937 Ormond Beach - Sarnia Imperials
• 1938 John Ferraro - Montreal Nationals
• 1939 Eddie Thompson - Toronto Balmy Beach Beachers
• 1940 Nick Paithouski - Sarnia 2/26 Battery
• 1941 Al Lenard - Hamilton Wildcats
• 1942 Bill Stukus - Toronto RCAF Hurricanes
• 1943 Bob Cosgrove - Toronto RCAF Hurricanes
• 1944 Joe Krol - Hamilton Wildcats
• 1945 Arnie McWatters - Ottawa Trojans
• 1946 Frank Gnup - Hamilton Wildcats
• 1947 Bob Paffrath - Toronto Indians
• 1948 Frank Filchock - Hamilton Tigers
• 1949 Don "Sleepy" Knowles - Sarnia Imperials
• 1950 Carl Galbreath - Toronto Balmy Beach Beachers
• 1951 Bruce Mattingly - Sarnia Imperials
• 1952 John Pont - Toronto Balmy Beach Beachers
• 1953 Dick Gregory - Toronto Balmy Beach Beachers
• 1954 Bob Celeri - Kitchener-Waterloo Dutchmen
• 1955 Bob Celeri - Kitchener-Waterloo Dutchmen

• Canadian Football League
• Quebec Rugby Football Union

• https://web.archive.org/web/20110727185339/http://www.profootballresearchers.org/Coffin_Corner/07-An-245.pdf
• http://www.cflapedia.com