The 2018 FIM MotoGP World Championship was the premier class of the 70th F.I.M. Road Racing World Championship season. Marc Márquez entered the season as the reigning champion, with Repsol Honda being the reigning team champions and Honda the reigning constructors' champions.

Marc Márquez Alentà is a Spanish Grand Prix motorcycle road racer who races for the satellite Ducati team Gresini Racing MotoGP. He previously raced for Honda's factory team from his MotoGP debut in 2013 until 2023. Born in Cervera, Catalonia, Spain, he is nicknamed the 'Ant of Cervera' worldwide (due to his height of 5' 7", and 'el tro de Cervera' in his hometown, meaning the 'Thunder of Cervera'. He is one of four riders to have won world championship titles in three different categories, after Mike Hailwood, Phil Read and Valentino Rossi, and is one of the most successful motorcycle racers of all time, with eight Grand Prix World Championships to his name, six of which are in the premier class. Márquez became the third Spaniard after Àlex Crivillé and Jorge Lorenzo to win the premier class title, and is the most successful Spanish rider in MotoGP to date, with 59 wins. In 2013 he became the first rider since Kenny Roberts in 1978 to win the premier class title in his first season, and the youngest to win the title overall, at 20 years and 266 days of age.