The Pittsburgh Athletic Club (PAC) was one of the earliest professional ice hockey teams. It was based in Pittsburgh, Pennsylvania from around 1895 until 1905 and again from 1907 to 1909.

The team was a member of the Western Pennsylvania Hockey League, which was formed in 1896.

In 1895, Pittsburgh officials, constructed the Schenley Park Casino which featured the first artificial ice-making plant in North America. The 1895–96 winter season also saw the first introduction of hockey in the city.

On December 30, 1895, the Pittsburgh Press made mention of a “great international hockey and polo tournament” opening game at the Casino. The newspaper reported that a team consisting of ten players from Queen's University played against a group of local players from Western University (today the University of Pittsburgh) and Pittsburgh Catholic College of the Holy Ghost (today Duquesne University) and a half-hour of exhibition of hockey was played before the polo match. The paper noted that 2,500 to 3,000 fans showed up to watch the game, despite claims of bad weather. No score or records were reportedly kept but the paper did note that the team from Queen's University outplayed the Pittsburghers, who had never played the game before.

After seeing the excitement and fan appeal of the hockey game, the Casino's management decided to organize a senior league at the rink. The league was strictly amateur and was named the Western Pennsylvania League. The league played its first season in 1896–97 at the Casino, with four teams, the Pittsburgh Athletic Club, the Duquesne Country & Athletic Club, Western University of Pennsylvania (the University of Pittsburgh today) and a team known as (All-)Pittsburgh, or the "Casino" team. The Pittsburgh Athletic Club team was managed by Charles S. Miller, who became the league's president.

The league played at the Casino twice a week, on Tuesday and Friday nights. The first "big league" championship (season) game was November 17, 1896 between Duquesne Country & Athletic Club and All-Pittsburgh, won by Duquesne 2–1; however, the league's season was cut short on December 16, when the Casino rink was destroyed by fire. The "Casino" team, Pittsburgh Athletic Club and Western University teams all lost their hockey equipment in the fire. A fire at the Casino in December 1896 destroyed the only ice hockey rink in Pittsburgh and the league dissolved without a championship.

The team and the league were revived by the construction of an artificial ice rink at the Duquesne Garden. The league's second season began on January 24, 1899, when the Garden hosted its first hockey game in a match between the Pittsburgh Athletic Club and Western University of Pennsylvania.

The Pittsburgh Athletic Club would then go on to claim the league’s first championship. The team then won the next two titles, which resulted in being awarded the $500 Trophy, in 1900 and again in 1901