Diaconu is a Romanian surname. It may refer to:
Adrian Diaconu (born 1978), Romanian professional boxer Andreea Diaconu (born 1991), Romanian model Eusebiu Diaconu (born 1981), Romanian Greco-Roman wrestler Ivan Diaconu (fl. 2000), Moldovan wrestler Mircea Diaconu (1949–2024), Romanian actor, writer, and politician Nicolae Diaconu (born 1980), Romanian water polo player Raul Diaconu (born 1989), Romanian footballer