The 2025 IMSA SportsCar Championship was a motor racing championship and the 55th racing season sanctioned by the International Motor Sports Association, which traced its lineage back to the 1971 IMSA GT Championship. It was also the twelfth season of the IMSA SportsCar Championship since the merger between the American Le Mans Series and the Rolex Sports Car Series in 2014, and the tenth under the sponsorship of WeatherTech.