The Hamilton Tigers were a Canadian football team based in Hamilton, Ontario that played in the Ontario Rugby Football Union from 1883 to 1906 and 1948 to 1949 and in the Interprovincial Rugby Football Union from 1907 to 1947. The club was a founding member of both the ORFU in 1883 and the IRFU in 1907. Throughout their history, the Tigers won five Grey Cup Championships as well as winning the Dominion Championship in 1908, the year before the Grey Cup was awarded. After struggling to compete on a sound financial level with the Hamilton Wildcats, who had joined the ORFU in 1941 and later the IRFU, the two clubs merged in 1950 to form the Hamilton Tiger-Cats.