Nicolae "Nae" Constantin (born 9 December 1973) is a Romanian football manager and former player, who is currently in charge of Liga I club Petrolul Ploiești. Mainly deployed as a centre-back, he spent most of his playing career at Petrolul Ploiești, Astra Ploiești, Rapid București and FC Brașov, among other brief stints. Although uncapped by the Romania national team, he was regarded as one of the best defenders of his generation.