Alan Armstrong (born 1962) is a United States Senator from Oklahoma and businessman.
Alan, Allan, Allen or Alun Armstrong may also refer to:
Sports Alun Armstrong (footballer) (born 1975), English footballer Allan Armstrong (cricketer) (fl. 1930s) on List of Rhodesian representative cricketers
Fictional characters Alan Armstrong (Spy Smasher) Senator Alan Armstrong on List of Stargate Universe characters Principal Allan Armstrong, character in Light It Up (film)
Others Alan Armstrong (writer) (born 1939), American writer Alun Armstrong (born 1946), English actor