Allais is a French surname. Notable people with the surname include:
Alphonse Allais (1854–1905), French writer and humorist
David Allais (born 1933), American businessman and inventor
Émile Allais (1912–2012), French alpine ski racer
Jean-Jacques Allais (born 1969), French professional footballer
Lucy Allais, philosopher
Maurice Allais (1911–2010), French economist
Nicolas Viton de Saint-Allais (1773–1842), French genealogist and littérateur
Pierre Allais (c. 1700–1782), French painter and pastel artist
