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- Randell Mills, American chemist and developer of the hydrino theory
- Reginald Mills (1912–1990), British film editor
- Richard Mills, multiple people
- Rob Mills (born 1982), Australian pop singer
- Robert Mills (architect) (1781–1855), American architect
- Robert Mills (physicist) (1927–1999), American physicist
- Robert Lee Mills (died 2006) former president of Georgetown College
- Robert P. Mills (1920–1986), American crime and science fiction magazine editor
- Roger George Mills (born 1948), English race walker
- Roger Q. Mills (1832–1911), American politician
- Royce Mills (born 1942), English actor
- Royden Mills, Canadian sculptor
- Russell Mills (artist) (born 1952), British artist, designed Pingu cartoons for CBBC
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