Delaunay is a French surname. Notable people with the surname include:
Catherine Delaunay (born 1969), French jazz clarinet player and composer
Charles Delaunay (1911–1988), French author and jazz expert
Elie Delaunay (1828–1891), French painter
Joseph-Charles Delaunay (d. 1802), French actor, father of Marie Dorval
Louis Arsene Delaunay (1826–1903), French actor
Robert Delaunay (1885–1941), French artist
Danielle Delaunay, English/Japanese singer
Sonia Delaunay (1885–1979), Ukrainian-French artist
Vadim Delaunay (1947–1983), Russian poet and dissident
Henri Delaunay (1883–1955), French football administrator
Jean-Pierre Delaunay (born 1966), French footballer
Pierre Delaunay, football administrator
Boris Delaunay (1890–1980), Soviet/Russian mathematician
Charles-Eugène Delaunay (1816–1872), French astronomer and mathematician
Natalya Delaunay (born 1923), Soviet/Russian geneticist
Nikolai Delaunay, Senior (1856–1931), Russian/Soviet physicist and mathematician
Nikolai Delaunay, Junior (1926–2008), Soviet physicist
Joseph Delaunay (1752–1794), sometimes called Delaunay d'Angers; a revolutionary-era French politician
Michèle Delaunay (born 1947), member of the National Assembly of France
Alcuin nó Delaunay, a fictional character
Anafiel Delaunay, a fictional spymaster and poet
Phèdre nó Delaunay, a fictional character
Delaunay Wikipedia (Text) CC BY-SA