William Garrett may refer to:
- William Garrett, co-writer of "Please Mr. Postman"
- William Garrett (Alabama politician) (1809–?), Secretary of State of Alabama, 1840–1852
- William Garrett (Medal of Honor) (1842–1916), American Civil War soldier
- Sir William Garrett (businessman) (1902–1977), British industrial chemist and businessperson
- William A. Garrett (1854–1951), American lawyer and politician in the Virginia Senate
- William B. Garrett III (born 1953), U.S. Army general
- William Garrett (cricketer) (1876–1953), English cricketer
- Bill Garrett (basketball) (1929–1974), first African American basketball player in the Big Ten athletic conference
- Billy Garrett Jr. (born 1994) American basketball player and grandson of Bill Garrett
- Bill Garrett (golfer) (1940–2010), American professional golfer
- Ted Garrett (William Edward Garrett, 1920–1993), British Labour Party politician
- Billy Garrett (1933–1999), American racecar driver
- William Garrett Lewis (1821–1885), British Baptist preacher
- W. G. Snuffy Walden (William Garrett Walden, born 1950), musician
- Sir William Garrett (died 1571), Lord Mayor of London, 1555–1556
This disambiguation page lists articles about people with the same name.
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