Diaconescu is a Romanian surname. Notable people with the surname include:
Camelia Diaconescu (b. 1963), rower Cristian Diaconescu (b. 1959), diplomat and politician Dan Diaconescu (b. 1967), politician, media tycoon, television presenter Grigoraș Diaconescu (b.1982), football player Ioana Diaconescu (b. 1979), swimmer Ion Diaconescu (1917–2011), dissident and politician Mircea Diaconescu (b. 1929), composer Rebecca Diaconescu (b. 2006), swimmer