Guilbault is a surname. Notable people with the surname include:
Édouard Guilbault (1834–1903), Canadian manufacturer, merchant and politician from Quebec Élise Guilbault (born 1961), Canadian film and television actress Geneviève Guilbault (born 1982), Canadian politician Jacques Guilbault (born 1936), Canadian politician Jean-Guy Guilbault (1931–2022), Canadian businessman and politician Jocelyne Guilbault, Canadian ethnomusicologist Muriel Guilbault (1922–1952), Canadian actress and comedian Roland Guilbault (1934–2012), American Navy rear admiral