William Garrett
William Garrett may refer to:
- William Garrett, co-writer of "Please Mr. Postman"
- Sir William Garrett, Lord Mayor of London, 1555–1556
- William Garrett (Alabama politician), Secretary of State of Alabama, 1840–1852
- William Garrett (businessman), British industrial chemist and businessperson
- William Garrett (cricketer), English cricketer
- William Garrett (Medal of Honor), American Civil War soldier
- William A. Garrett, American lawyer and politician in the Virginia Senate
- William B. Garrett III, U.S. Army general
- William Davis "Dub" Garrett, American football player
- Billy Garrett, American racecar driver
- Billy Garrett Jr. American basketball player and grandson of Bill Garrett
- Bill Garrett (basketball), first African American basketball player in the Big Ten athletic conference
- Bill Garrett (golfer), American professional golfer
- Ted Garrett, British Labour Party politician
- William Garrett Lewis, British Baptist preacher
- W. G. Snuffy Walden, musician