Petrobrazi Refinery is one of the largest Romanian refineries and one of the largest in Eastern Europe, located near Ploiești, Prahova County having as a main activity the processing of Romanian oil but also has a separate unit specialised in processing chemical products.

[1][2] Petrobrazi was founded on 17 June 1934 by the Creditul Minier Society in a strategic industrial zone of 440 ha (4.4 km2) located in Southern Romania near Ploiești.

[4] Designated as target Blue by the USAAF for Operation Tidal Wave,[5] and being the least defended refinery of Ploiești, it was heavily damaged by the resulting fires as the German firefighter teams refused to extinguish them for fear of the detonation of other delay-action bombs.

Repair work began in September 1943, with financial aid received from the Romanian Ministry of Economy and the German Government.

[4] In 1962 Petrobrazi became the first modern refinery in Romania with the addition of the catalytic cracking and reforming processes.