William Kerr was the co-owner of the Pittsburgh Pirates baseball team of the National League from
- REDIRECT Template:Baseball year through
- REDIRECT Template:Baseball year with Phil Auten. They purchased the team from William A. Nimick in 1891. They sold the Pirates to Barney Dreyfuss in 1900.
Kerr was known throughout the organization for his short temper. He changed managers frequently during his tenure with the Pirates. It was reported that after the 1896 Pirates season, in which the team posted a 66-63 record, team manager, Connie Mack, left the Pirates due to Kerr's frequent outbursts.
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