The 2015 Monaco Grand Prix, formally known as the Grand Prix de Monaco 2015, was a Formula One motor race that was held on 24 May 2015 at the Circuit de Monaco, a street circuit that runs through the principality of Monaco. It was the sixty-second running of the race as a World Championship event, and seventy-third running overall. Mercedes driver Lewis Hamilton entered the race with a twenty-point lead over teammate and defending race winner Nico Rosberg in the Drivers' Championship, with Mercedes having a seventy-point lead over Ferrari in the Constructors' Championship.