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- Terrance Howell (Singer/Artist/Actor) (born 1991), African American Singer/Artist/Actor Who went to Great Onyx Job Corps
- Thomas Howell (bishop) (1588–1650), British clergyman
- Thomas Howell (poet), British poet
- Thomas Bayly Howell (1767–1815), English lawyer and writer who lent his name to Howell's State Trials
- Thomas J. Howell (botanist) (1842–1912), American botanist
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