Allais is a French surname. Notable people with the surname include:
Alphonse Allais (1854–1905), French writer and humoristDavid Allais (born 1933), American businessman and inventorÉmile Allais (1912–2012), French alpine ski racerJean-Jacques Allais (born 1969), French professional footballerLucy Allais, philosopherMaurice Allais (1911–2010), French economistNicolas Viton de Saint-Allais (1773–1842), French genealogist and littérateurPierre Allais (c. 1700–1782), French painter and pastel artist