Others
- William F. Butler, African American leader after the American Civil War
- William Archer Butler (1814–1848), Irish historian of philosophy
- William Butler (judge) (1822–1909), U.S. federal judge
- William Butler (musician) (born 1982), U.S. musician, member of the Arcade Fire
- William Butler (author), author of the novel The Butterfly Revolution
- William Butler (alchemist), Irish alchemist
- William Butler (priest) (1818–1894), High Church Anglican priest
- William James Butler (1862–1934), New Zealand sawmiller and timber merchant
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