William F. "Bill" Bailey (April 12, 1888 – November 2, 1926) was an American left-handed pitcher in Major League Baseball.

[1] Bailey first pitched in the major leagues in 1907 for the St. Louis Browns, and he remained with the team through the 1912 season.

In 1915, his second Federal League season, Bailey lost 20 games.

In Bailey's later minor league career, he lost 20 or more games two more times.

[1] Before Bailey could appear in any games in 1926, he developed intestinal bleeding and was admitted to Baptist Hospital in Houston, where he underwent blood transfusions.