|Born: August 10, 1892|
|Died: February 10, 1958 (aged 65)|
|April 23, 1914, for the Philadelphia Phillies|
|Last MLB appearance|
|September 13, 1927, for the Chicago White Sox|
|Earned run average||3.55|
William Elmer Jacobs (August 10, 1892 – February 10, 1958) was a pitcher in Major League Baseball from 1914 to 1927. He played for the Philadelphia Phillies, Pittsburgh Pirates, St. Louis Cardinals, Chicago Cubs, and Chicago White Sox. Jacobs' key pitch was the curveball. In 1926, he was suspended for 10 days after being caught with foreign substances on the mound.