Born in Adapazarı, Çetin began playing football with local side Sakaryaspor. He started to play regularly for Fenerbahçe in 1988. He became one of the franchise players for Fenerbahçe and Turkish football generally. He is well known for his superior ability to organize the midfield and also had decent vision, passing and shooting skills. He is known as "emperor" by Turkish soccer fans. Mostly walking on the pitch, Oguz Cetin was more of a distributor. Best known for his milimetric passes, he led Fenerbahçe to championship in 1995-96 season but Fenerbahçe chairman Ali Sen released Oğuz Çetin and his fellow striker Aykut Kocaman with the thought they have been destroying the harmony in the team. Çetin played for Istanbulspor and Adanaspor after he was released by Fenerbahçe in 1996.
After his playing career ended, Çetin became assistant manager for Fenerbahçe in 2002. After Werner Lorant's dismissal, he worked as manager for Fenerbahçe. However, he failed to manage the team well. He also worked as manager for Gençlerbirliği and Diyarbakırspor.