The McLaren MCL33 is a Formula One racing car designed and constructed by McLaren to compete in the 2018 FIA Formula One World Championship. The car was driven by two-time World Drivers' Champion Fernando Alonso and Stoffel Vandoorne, with additional testing and development work carried out by reigning European Formula 3 champion Lando Norris and McLaren's regular test driver Oliver Turvey. The MCL33 is the first car built by McLaren to use a quasi-works Renault engine after the team terminated its engine supply deal with Honda after three years. It made its competitive debut at the 2018 Australian Grand Prix. The car was launched with an orange and blue livery designed as a tribute to some of the team's earliest cars.