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- Walter Howell (born 1929), Australian rower
- Wayne Howell (1921–1993), American voice-over announcer
- William Howell (rugby player) (1863-unknown), Welsh rugby union player
- William Henry Howell (1860–1945), American physiologist
- William J. Howell (born 1943), American Republican politician
- W. Nathaniel Howell (born 1939), U.S. Ambassador to Kuwait, 1987–1991
- William R. Howell, American businessman
- William Roe Howell (1846–1890), American photographer
- William Thompson Howell (1810–1870), American jurist and politician
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