Legault is a surname. Notable people with the surname include:
Carl Legault (1923–83), Canadian politicianClaude Legault (born 1963), Canadian actorDiane Legault (born 1956), Canadian politicianFrançois Legault (born 1957), Canadian politicianHugues Legault (born 1974), Canadian freestyle swimmerJosée Legault (born 1966), Canadian journalistKarine Legault (born 1978), Canadian freestyle swimmerKyle Legault (born 1985), Canadian speedway riderLance LeGault (1937–2012), American actorLéonard Legault (born 1935), Canadian diplomatPaul Legault (born 1985), Canadian-American poetThéodore Legault (1886–1935), Canadian politicianThierry Legault (born 1962), French astrophotographer