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- Malcolm Knowles (1913–1997), American theorist in adult education
- Mark Knowles (born 1971), professional Bahamian tennis player
- Mark Knowles (born 1984), Australian field hockey player
- Martin Knowles, English dubstep musician known as Emalkay
- Mathew Knowles (born 1951), father of Beyoncé and Solange Knowles
- Matt Knowles (born 1974), American professional wrestler
- Michael Knowles:
- Michael Knowles (actor), English actor and scriptwriter, best known for his role as 'Captain Jonathan Ashwood', in the 1970s sitcom 'It Ain't Half Hot Mum'
- Michael Knowles (politician) (born 1942), British Conservative Member of Parliament for Nottingham East 1983–1992
Read more about this topic: Knowles (surname)