The 1915 Chicago Whales season was a season in American baseball. After not having an official nickname in 1914, the team officially became the Whales for the 1915 season. They finished the season with an 86–66 record, placing them in a statistical tie with the St. Louis Terriers for first place in the Federal League. However, since the Whales had a slightly better winning percentage, they were declared the league champions.

The Chicago Whales were a professional baseball team based in Chicago. They played in the Federal League, a short-lived "third Major League", in 1914 and 1915. They originally lacked a formal nickname, and were known simply as the "Chicago Federals" to distinguish them from the Chicago Cubs and Chicago White Sox.