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- Margaret Howell (born 1946), British fashion designer
- Mark Howell (born 1952), American musician
- Markus Howell (born 1975), Canadian football player
- Mary Howell (1932–1998), American physician and psychologist
- Matilda Howell (1859–1938), American archer
- Mike Howell (born 1943), former American footballer
- Myfanwy Howell, Welsh broadcaster
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