Donnay is a surname. Notable people with the surname include:
Gabrielle Donnay (1920–1987), German-born American crystallographer and historian of science Jacques Donnay (1925–2024), French politician Maurice Donnay (1859–1945), French dramatist Roberta Donnay (born 1966), American jazz singer, musician, composer, and producer
See also Donnay, Belgian sporting-goods company Donnay, Calvados, in France