The 1988 CART PPG Indy Car World Series season was the 10th national championship season of American open wheel racing sanctioned by CART. The season consisted of 15 races, and one non-points exhibition event. Danny Sullivan was the national champion, winning for Team Penske. The rookie of the year was John Jones. The 1988 Indianapolis 500 was sanctioned by USAC, but counted towards the CART points championship. Rick Mears won the Indy 500, his third victory at Indy.
