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- Rachel Allen (born 1972), Irish chef
- Ralph Allen (1693–1764), post-master, builder, philanthropist
- Ralph Allen (journalist) (1913–1966), Canadian journalist, editor and novelist
- Ralph Allen (painter) (born 1952), Haitian painter
- Ralph Shuttleworth Allen (1817–1887), British Conservative Member of Parliament
- Ray Allen (born 1975), American basketball player
- Ray R. Allen (1920–2010), Alexandria, Louisiana, public official
- Raymond Allen, several people
- Red Allen (c. 1906–1967), American jazz trumpeter
- Red Allen (bluegrass) (1930–1933), American bluegrass singer and guitarist
- Richard Allen, several people
- Rick Allen (drummer) (born 1963), English rock drummer
- Robert Allen, several people
- Rod Allen (advertising executive) (1929–2007), British advertising executive
- Rod Allen (born 1959), American television baseball commentator
- Roger Allen (politician), Canadian politician
- Roger MacBride Allen (born 1957), American science fiction author
- Ronald Allen, several people
- Rosalind Allen (born 1957), New Zealand actress
- Rose Allen, one of the Colchester Martyrs
- Ryan Allen (Born 1986) Boise State Wrestler, Mavericks Coach, Artist.
- R. G. D. Allen (Roy George Douglas Allen) (1906–1983), English economist and mathematician
- Russell Allen (born 1971), American singer
- Russell Allen (American football) (born 1986), American football player
- Ruth Allen (singer), British cabaret singer
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