B
- Barbara Mills, British barrister and public servant
- Barry Mills, multiple people
- Beatrice Mills, (1883–1972), American-born Countess of Granard, Officer of the Order of the British Empire
- Ben Mills, British singer
- Bernard Y. Mills, Australian astronomer, first to detect that the Sculptor Galaxy is a radio source
- Bertram Mills (1873–1938), British circus owner
- Billy G. Mills (born 1929), American politician and judge
- Billy Mills (born 1938), American Olympic runner
- Billy Mills (poet), Irish poet
- Bob Mills (comedian) (born 1957), British comedian and radio presenter
- Bob Mills (politician) (born 1941), Canadian politician
- Brad Mills (born 1957), American baseball player and coach
- Brian Mills, British television director
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