Ralph Allen (1693–1764) was an English entrepreneur and philanthropist, notable for his reforms to the UK postal system.

Ralph Allen may also refer to:

Ralph Allen (journalist) (1913–1966), Canadian journalist, editor, and novelist Ralph G. Allen (1934–2004), American writer and scholar Ralph Allen (painter, born 1926) (1926–2019), Canadian painter Ralph Allen (painter, born 1952), Haitian painter Ralph Shuttleworth Allen (1817–1887), British Conservative Member of Parliament 1868–1879 Ralph Allen (footballer) (1906–1981), English professional footballer Ralph O. Allen, professor of chemistry and environmental sciences

See also Allen (surname)