J
- Jack Mills, driver of train in the Great Train Robbery (1963)
- James Mills, multiple people
- Jay Mills, American football coach
- Jeff Mills (born 1963), American DJ and music producer
- Jerry Mills (1951–1993), gay cartoonist
- Jill Mills, American strongwoman
- Jim Mills, Canadian football player
- Jim Mills, Welsh rugby union and rugby league footballer of the 1960s and '70s
- John Mills, multiple people including:
- John Mills (1908–2005), British actor
- John Mills (cricketer) (1905–1972), New Zealand test cricketer
- John Mills (encyclopedist), 18th century English encyclopedist
- John Easton Mills (1796–1847), Canadian politician who was briefly mayor of Montreal, Quebec
- John T. Mills (1817–1871), American lawyer and judge
- John Atta-Mills (born 1944), President of The Republic of Ghana
- John Channell Mills (1929–1998), British actor
- John Myles-Mills, Ghanaian athlete
- John Mills-Cockell, Canadian composer
- Joshua Mills, American physician and politician
- Judson Mills, American actor
- Juliet Mills (born 1941), British character actress
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