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- Sam Mills (1959–2005), American football player
- Samuel John Mills (1783–1818), American preacher
- Samuel Sylvester Mills (1806–1874), Canadian businessman and member of the Senate of Canada
- Scott Mills (born 1974), British DJ
- Stephanie Mills (born 1957), African-American singer
- Stephanie Mills (All in the Family)
- Stephen Mills Artistic directory, Ballet Austin
- Steve Mills, multiple people including:
- Steve Mills (footballer) (1953–1988), English footballer with Southampton
- Steve Mills (rugby union), (born 1951), English international rugby union player
- Steve Mills (juggler),(born 1957), a juggler and unicyclist from New Jersey
- Steve Mills (character), a fictional character on the New Zealand soap opera Shortland Street
- Susan Tolman Mills (1825–1912), co-founder and first president of Mills College
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