The 2013 IZOD IndyCar Series was the 18th season of the IndyCar Series and the 102nd season of American open wheel racing. Its premier event was the 97th Indianapolis 500 held on Sunday, May 26. The 2013 season was the second to feature the Dallara DW12 chassis. Ryan Hunter-Reay entered the season as the defending drivers' champion. Chevrolet entered as the defending Manufacturers' Cup champion.