Gaius Quinctius Certus Poblicius Marcellus was a Roman senator active in the first quarter of the second century AD. He was suffect consul for the nundinium of May to June AD 120, with Titus Rutilius Propinquus as his colleague.[1] The more common and shorter version of his name is Gaius Poblicius Marcellus;[2] he is known primarily from inscriptions. He later served in Syria as the imperial legate (the province's governor).