Grandmaison is a surname. Notable people with the name include:
Isabel Grandmaison de Godin (1728–1792), 18th-century woman separated from her husband by politics for over 20 years Adam Grandmaison (born 1983), American podcaster and YouTuber known as Adam22 Aubin-Louis Millin de Grandmaison (1759–1818), French antiquary and naturalist Charles de Grandmaison (1824–1903), French archivist and historian Didier Lecour Grandmaison (1889–1917), World War I flying ace credited with five aerial victories Louis Loyzeau de Grandmaison (1861–1915), French military theorist Madeleine de Grandmaison (born 1938), Martinican politician, member of the Martinican Democratic Rally Mike Grandmaison (born 1954), Canadian freelance photographer specializing in nature Nicholas Raphael de Grandmaison CM RCA (1892–1978), Russian-born Canadian artist Olivier Le Cour Grandmaison (born 1960), French political scientist and author Pascal Grandmaison (born 1975), Canadian artist working in film, video, photography and sculpture Valerie Grandmaison (born 1988), Canadian swimmer and Paralympic champion François-Auguste Parseval-Grandmaison (1759–1834), French poet
See also John A. Macdonald Memorial (Grandmaison), Canadian bronze public sculpture by Sonia de Grandmaison and John Cullen Nugent