Professional American football championship games 

Below is a list of professional football championship games in the United States, involving:

From 1903 through 1919 the Ohio Football League existed and was un-officially recognized as the world champion of professional football. In 1920, the American Professional Football Association (APFA) started play and was later renamed the National Football League (NFL). The NFL conducted play for thirteen years before concocting a "championship game". From 1920 through 1932, league "champions" were determined by won-loss record, but the schedules and rules were so ill-defined that conflicts exist to this day over who the actual champions were. Some teams played more games than others; some played against college or semi-pro teams; some played after the season was over, some stopped play before a season was over. For example, in 1921, the Buffalo All-Americans disputed the Chicago Staleys' title, and in 1925, the Pottsville Maroons claimed the championship was theirs, not the Chicago Cardinals'.

The APFA had no championship games before it changed its name to the NFL in 1922. Boston/Washington Redskins owner George Preston Marshall is credited with significant innovations by the NFL. In 1933, Marshall convinced the NFL to play a championship game between two division winners. Thus, 1933 was the year of the first professional football championship game in the United States. See National Football League championships.

Game scores marked with a † (1921 and 1932) were not official championship games, but were the deciding games in determining a championship and also the last games played in a season.

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