The 2012 Monaco GP2 Series round and the 2012 Monaco GP3 Series round were a pair of motor races held at the Circuit de Monaco in the Principality of Monaco as part of both the GP2 and GP3 Series. The races, held on 25 and 26 May, were in support of the Monaco Grand Prix. The GP2 races was the fifth round of the 2012 GP2 championship, while the GP3 races formed the second round of the 2012 GP3 season. 2012 marked the first time that the GP3 Series held at the Circuit de Monaco.