William John Orr (April 22, 1891 – March 10, 1967) was a Major League Baseball infielder. He played parts of two seasons in the majors, 1913 and 1914, for the Philadelphia Athletics. He played primarily at shortstop, but also played all three other infield positions.

Billy Orr
Shortstop
Born: (1891-04-22)April 22, 1891 San Francisco, California, US
Died: March 10, 1967(1967-03-10) (aged 75) St. Helena, California, US
Batted: Right Threw: Right
MLB debut
May 3, 1913, for the Philadelphia Athletics
Last MLB appearance
May 22, 1914, for the Philadelphia Athletics
MLB statistics
Batting average	.187
Home runs	0
Runs batted in	8
Teams
Philadelphia Athletics (1913–14)
Career highlights and awards
World Series champion (1913)

After his major league career, Orr played for ten years in the Pacific Coast League. He also briefly served as head coach of the Stanford Cardinal baseball program, and managed the Salt Lake City Bees in 1926.