'''Grenier''' is a surname. It is a French word for ''attic, loft,'' or ''granary''. Notable people with the surname include:
* Adrian Grenier * Angèle Grenier, Canadian maple syrup producer * Auguste Jean François Grenier (1814–1890), French doctor and entomologist * Clément Grenier * Eustace Grenier * Hugo Grenier, French tennis player * Jacques de Grenier (1736–1803), French Navy officer * Jean Charles Marie Grenier (1808–1875), French botanist and naturalist * Jim Grenier, American politician * John Grenier * Katia Grenier, French microwave and microfluidics engineer * Louis Grenier, fictional character * Marie-Louise Grenier (1845–1925), French circus lion tamer who took the name Nouma-Hawa * Martin Grenier * Mikaël Grenier, Canadian racing driver * Paul Grenier (1768–1827), French general * Philippe Grenier * Richard Grenier (disambiguation) * Robert Grenier (CIA officer) * Robert Grenier (poet) * Roger Grenier * Suzanne Blais-Grenier * Sylvain Grenier * Walter I Grenier, Lord of Caesarea * Zach Grenier
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