The 2015 Monaco GP2 Series round was a pair of motor races held on 22 and 23 May 2015 at the Circuit de Monaco, Monte Carlo, Monaco as part of the GP2 Series. It was the third round of the 2015 GP2 season and was run in support of the 2015 Monaco Grand Prix. The first race, a 40-lap feature event, was won by ART Grand Prix driver Stoffel Vandoorne who started from fourth position. Alexander Rossi finished second for Racing Engineering, and MP Motorsport driver Sergio Canamasas came in third. Status Grand Prix driver Richie Stanaway won the second event, a 30-lap sprint race, ahead of Trident's Raffaele Marciello and Sergey Sirotkin of the Rapax team.

The 2015 GP2 Series season was the forty-ninth season of the second-tier of Formula One feeder championship and also eleventh season under the GP2 Series moniker, a championship for open-wheel racing cars run as a support series to the 2015 Formula One World Championship. Twenty-six drivers representing thirteen teams raced over eleven rounds, starting in Bahrain on 18 April and finishing in Abu Dhabi on 29 November.