The 2018 FIM Motocross World Championship was the 62nd FIM Motocross World Championship season. It included 20 events, started at Neuquen in Argentina on 4 March, and ended at Imola in Italy on 30 September. Jeffrey Herlings dominated the main championship by winning 33 races out of 40, getting on the podium in every race he started.
A 20-round calendar for the 2018 season was announced on 25 October 2017.