de Rosnay is a French surname and may refer to:
Gaëtan de Rosnay (1912–1992), French painter Joël de Rosnay (born 1937), Mauritian-born French science writer, and molecular biologist Jenna de Rosnay (born 1963), American windsurfer, fashion designer, and model Tatiana de Rosnay (born 1961), Franco-British writer Xavier de Rosnay (born 1982), member of the French electronic-house duo Justice
See also Drosnay, a commune in Marne, France