Voicu is a Romanian surname. notable people with this surname include:
Voicu (?-?), (Vajk in Hungarian, Wojk in some historical sources), was a Wallah (Romanian) Knyaz (Cnezat) of the Hunedoara domain; son of Şerban (Serbe) and father of John Hunyadi, who was a Voivode of Transylvania (from 1441), captain-general (1444–1446) and regent (1446–1453) of the Kingdom of Hungary. He was also the father of Matthias Corvinus of Hungary, one of its most renowned kings.Ion Voicu (1923–1997), Romanian violinist and conductorIonuț Voicu (born 1984), Romanian footballerIrinel Voicu (born 1977), Romanian footballerMădălin Voicu (born 1952), Romanian musician and politicianMircea Voicu (born 1980), Romanian footballer