William James Campbell (November 5, 1873 – October 6, 1957) was an American professional baseball player. He was a left-handed pitcher over parts of four seasons (1905, 1907–09) with the St. Louis Cardinals and Cincinnati Reds. For his career, he compiled a 23–25 record, with a 2.80 earned run average, and 116 strikeouts in 407⅔ innings pitched.

Billy Campbell
Pitcher
Born: (1873-11-05)November 5, 1873 Pittsburgh, Pennsylvania, U.S.
Died: October 6, 1957(1957-10-06) (aged 83) Cincinnati, Ohio, U.S.
Batted: Left Threw: Left
MLB debut
April 17, 1905, for the St. Louis Cardinals
Last MLB appearance
August 23, 1909, for the Cincinnati Reds
MLB statistics
Win–loss record	23–25
Earned run average	2.80
Strikeouts	116
Teams
St. Louis Cardinals (1905) Cincinnati Reds (1907–1909)

He was born in Pittsburgh, Pennsylvania and later died in Cincinnati, Ohio at the age of 83.