Grenier is a surname. Notable people with the surname include:
Adrian Grenier
Clément Grenier
Eustace Grenier
Henri-Georges Grenier
John Grenier
Louis Grenier, fictional character
Martin Grenier
Philippe Grenier
Richard Grenier (disambiguation)
Robert Grenier, a former CIA officer
Robert Grenier (poet)
Roger Grenier
Suzanne Blais-Grenier
Sylvain Grenier
Walter I Grenier, Lord of Caesarea
Zach Grenier