Dadi is a surname. Notable people with the surname include:
Bilkis Dadi (born 1937/38), Indian activist Birtukan Ayano Dadi (born 1975), Ethiopian judge and diplomat Eugène Dadi (born 1973), Ivorian footballer Firdaus Dadi, Indian actress Marcel Dadi (1951–1996), Tunisian-born French guitarist Zhou Dadi (born 1996), Chinese football player