A
- Abner P. Allen (1839–1905), American Medal of Honor recipient
- Albert Allen (1867–1899), English footballer
- Alexander Viets Griswold Allen (1841–1908) American Episcopal theologian
- Alfred Allen (disambiguation), various people
- Andrew Allen (Pennsylvania) (1740–1825), representative to the Continental Congress
- Andrew M. Allen (born 1955), American astronaut
- Andy Allen (footballer) (born 1974), former English association footballer
- Anita Allen (pentathlete), American modern pentathlete
- Anthony A. Allen (British entomologist)
- Arnold Allen, American computer scientist
- Arthur Allen, several people
- Asa A. Allen (US Pentecostal evangelist and faith healer)
- Ashley Allen (born 1968), American model and actress
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