The 2008 Detroit Indy Grand Prix presented by Firestone was an IndyCar Series race that was held on August 31, 2008 on the Raceway on Belle Isle in Detroit, Michigan.

Hélio Castroneves finished second, and Tony Kanaan clinched third.

[4] Scott Dixon claimed pole position for the race, and led through the first lap.

Dixon and Castroneves, who had qualified second, pulled away from the pack, until the seventeenth lap, when a full-track caution was issued after an incident between Dan Wheldon and Jamie Camara.

Despite a late push by Castroneves to pass Wilson, the rookie British driver maintained his position to claim victory.