Valentin Sinescu (born 16 July 1963) is a Romanian football manager and former footballer. As a footballer, Sinescu played for Astra Ploiești in the lower leagues, during the 1980s and 1990s. In parallel with his football career, Sinescu studied petrochemical engineering and then worked as an engineer at the Ploiești Refinery, hence his nickname, "the engineer".