Gadbois is a surname. Notable people with the surname include:
Dennis Gadbois (born 1963), American football player Denyse Gadbois (1921–2013), Canadian artist Edgar Gadbois (born ), American politician Geoffrey Gadbois (born 1994), American bobsledder Louise Landry Gadbois (1896–1985), Canadian painter Richard Arthur Gadbois Jr. (1932–1996), American judge