Delaunay is a French surname. Notable people with the surname include:
People
Arts
- Catherine Delaunay (born 1969), French jazz clarinet player and composer
- Charles Delaunay (1911–1988), French author and jazz expert
- Joseph-Charles Delaunay (d. 1802), French actor, father of Marie Dorval
- Jules-Élie Delaunay (1828–1891), French painter
- Louis Arsene Delaunay (1826–1903), French actor
- Louis Delaunay (1854–1937), French actor
- Nicolas Delaunay (1739-1792), French engraver
- Robert Delaunay (1885–1941), French artist
- Rose Delaunay (1857–after 1937), French opera ainger
- Danielle Delaunay, English/Japanese singer
- Sonia Delaunay (1885–1979), Ukrainian-French artist
- Vadim Delaunay (1947–1983), Russian poet and dissident
Football
- Henri Delaunay (1883–1955), French football administrator
- Jean-Pierre Delaunay (born 1966), French footballer
- Pierre Delaunay, football administrator
Science
- Boris Delaunay (1890–1980), Soviet/Russian mathematician, inventor of Delaunay triangulation
- Charles-Eugène Delaunay (1816–1872), French astronomer and mathematician
- Natalya Delaunay (1923-?), Soviet/Russian geneticist
- Nikolai Delaunay, Senior (1856–1931), Russian/Soviet physicist and mathematician
- Nikolai Delaunay, Junior (1926–2008), Soviet physicist
Politics
- 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
Fictional characters
- Various characters in the fantasy novel Kushiel's Dart (2001):
- Alcuin nó Delaunay
- Anafiel Delaunay, spymaster and poet
- Phèdre nó Delaunay
See also
- Delaunay-Belleville, a French luxury automobile
- Delaunay (crater), a lunar crater
- Delaunay triangulation, a way to divide a plane into triangles
- Delannoy