Legault is a surname of French origin, most prevalent amongst French Canadians. Notable people with the surname include:
Carl Legault (1923–83), Canadian politician Charles-Alexis Legault (born 2003), Canadian ice hockey player Claude Legault (born 1963), Canadian actor Diane Legault (born 1956), Canadian politician Émile Legault (born 2000), Canadian soccer player François Legault (born 1957), Canadian politician and 32nd premier of Quebec Hugues Legault (born 1974), Canadian freestyle swimmer Josée Legault (born 1966), Canadian journalist Karine Legault (born 1978), Canadian freestyle swimmer Kyle Legault (born 1985), Canadian speedway rider Lance LeGault (1937–2012), American actor Léonard Legault (1935–2017), Canadian diplomat Paul Legault (born 1985), Canadian-American poet Suzanne Legault, former Information Commissioner of Canada Théodore Legault (1886–1935), Canadian politician Thierry Legault (born 1962), French astrophotographer
See also 19458 Legault, an asteroid Legault, a character from the video game Fire Emblem