The 2018 Verizon IndyCar Series was the 23rd season of the Verizon IndyCar Series and the 107th official championship season of American open wheel racing. The premier event was the 102nd Indianapolis 500, with Takuma Sato entering as the defending Indianapolis 500 winner. Josef Newgarden entered the season as the defending National Champion.

The 2018 Indianapolis 500 was a Verizon IndyCar Series held on Sunday, May 27, 2018, at the Indianapolis Motor Speedway in Speedway, Indiana. It was the premier event of the 2018 IndyCar Series. The race was won by Australian Will Power of Team Penske. Car owner Roger Penske collected his record extending 17th Indianapolis 500 victory. Chevrolet swept nine of the top eleven spots during qualifying, and finished 1st-2nd, Chevy's first Indy victory since 2015, and tenth overall. However, despite entering the month as prohibitive favorites to dominate the race, Chevy managed to place only two other cars in the top ten.