William Harry Hallman (March 15, 1876 – April 23, 1950) was an American professional baseball player.

As an outfielder, he played for three different teams in Major League Baseball; the Milwaukee Brewers in 1901, the Chicago White Sox in 1903, and the Pittsburgh Pirates in 1906 and 1907.

[1] Additionally, he had a long minor league baseball career, beginning in 1894 and ending in 1914.

[2] Hallman died at the age of 74 in his hometown of Philadelphia, Pennsylvania, and is interred at Mount Peace Cemetery.

[1] He is the nephew of Bill Hallman, who also played baseball at the Major League level.