Thibeault is a surname of French origin, a form of Theobald. People with the surname include:
- Fabienne Thibeault (born 1952), Canadian singer
- Glenn Thibeault (born 1969), Canadian politician
- Larry Thibeault (1915–1977), Canadian ice hockey player
- Tammara Thibeault (born 1996), Canadian boxer
- Yolande Thibeault (born 1939), Canadian journalist and politician