The 2018 IMSA SportsCar Championship was the 48th motor racing championship sanctioned by the International Motor Sports Association (IMSA) (which traces its lineage to the 1971 IMSA GT Championship). It was the fifth season of the United SportsCar Championship and third to be held under the name as the WeatherTech SportsCar Championship. It began on January 27 with the 24 Hours of Daytona, and ended on October 13 with the Petit Le Mans.