Thériault is a surname. Notable people with the surname include:
Bernard Thériault (born 1955), Canadian politicianBruno Thériault (1917–2005), blind piano tuner, regional administrator for the Canadian National Institute for the BlindCamille Thériault (born 1955), Canadian politician, former premier of New BrunswickCharles Theriault, Maine politicianDenis Thériault (born 1959), Canadian writerEdward Joseph Thériault (1901–1968), Liberal party member of the Senate of CanadaÉlisée Thériault (1884–1958), lawyer and political figure in QuebecÉric Thériault (born 1967), Canadian cartoonistGérard Charles Édouard Thériault (1932–1998), former Canadian Chief of Defense StaffHarold Theriault, Canadian politicianJanine Theriault (born 1975), Canadian actressJean-Yves Thériault, bassist from Canadian metal group VoivodJean-Yves Thériault (kickboxer) (born 1955), Canadian kickboxerLévite Thériault (1837–1896), land owner and political figure in New BrunswickLise Thériault (born 1966), Quebec politicianLyn Thériault, formerly known as Lyn Faust, politician in Montreal, Quebec, CanadaMathieu Corbeil-Thériault (born 1991), Canadian ice hockey goaltenderMilaine Thériault (born 1973), Canadian skierNicole Theriault, known as Nikki, Thai singerNorbert Thériault (born 1921), Canadian politicianPaul Thériault, Canadian politician, former leader of the Yukon Liberal PartyRoch Thériault (1947–2011), religious leaderSean Theriault, American professorSerge Thériault (born 1948), Quebec comedian and actorYves Thériault (1915–1983), Canadian author