The Pittsburgh Athletic Club football team, established in 1890, was based in Pittsburgh, Pennsylvania. In 1892 the intense competition between two Pittsburgh-area clubs, the Allegheny Athletic Association and the Pittsburgh Athletic Club, led to William (Pudge) Heffelfinger becoming the first known professional football player. Heffelfinger was paid $500 by Allegheny to play in a game against Pittsburgh on November 12, 1892. As a result, Heffelfinger became the first person to be paid to play football. Allegheny would go on to win the game, 4–0, when Heffelfinger picked up a Pittsburgh fumble and ran it 35 yards for a touchdown. In 1893, Pittsburgh again made history when it signed one of its players, probably halfback Grant Dibert, to the first known pro football contract, which covered all of the team's games for the year.

The Allegheny Athletic Association was an athletic club that fielded the first ever professional American football player and later the first fully professional football team. The organization was founded in 1890 as a regional athletic club in Allegheny, Pennsylvania, which is today the North Side of Pittsburgh.