Groulx is a surname. Notable people with the surname include:
- Benoit Groulx (Canadian football) (born 1985), Canadian football player
- Benoit Groulx (ice hockey) (born 1968), Canadian ice hockey player
- Benoit-Olivier Groulx (born 2000), French-born Canadian hockey player
- Danny Groulx (born 1981), Canadian hockey player
- Danny Groulx (Canadian football) (born 1990), Canadian football player
- Georges Groulx (1922–1997), Canadian actor
- Gilles Groulx (1931–1994), Canadian filmmaker
- Henri Groulx (1888–1952), Canadian pharmacist and politician
- Joseph Groulx (c. 1884–?), Franco-Ontarian storyteller
- Lionel Groulx (1878–1967), Canadian priest, historian and nationalist
- Pierre Groulx (born 1975), Canadian hockey coach
- Sébastien Groulx (born 1974), Canadian weightlifter
- Sylvie Groulx, Canadian filmmaker
- Teddy Groulx (1883–1936), Canadian hockey player
- Wayne Groulx (born 1965), Canadian-born Austrian hockey player
- Will Groulx (born 1974), American wheelchair rugby player