Allain is both a surname and a given name. Notable people with the name include:
Surname Alexander Allain (1920–1994), American lawyer and library advocate Bret Allain, American politician Keith Allain (born 1958), American ice hockey player and coach Marcel Allain (1885–1969), French writer Oscar Allain (1922–2025), Peruvian painter Pierre Allain (1904–2000), French mountain climber Raymonde Allain (1912–2008), French model and actress Rhett Allain, American physicist Rick Allain (born 1969), Canadian ice hockey player and coach Stephanie Allain (born 1959), American film producer Tara Allain (born 1985), American beauty pageant winner Theophile T. Allain (1846–1917), American politician Valérie Allain (born 1966), French actress William Allain (1928–2013), American politician
Given name Allain Gaussin (born 1943), French composer Allain Provost, French landscape architect Allain Roy (born 1970), Canadian ice hockey player Allain Tikko (1979–2009), Estonian military officer
See also Alain (disambiguation)