2005 Rolex Sports Car Series

The 2005 Rolex Sports Car Series season was the sixth season of the Rolex Sports Car Series run by the Grand American Road Racing Association, and the fourth season under the sponsorship of Rolex. It began on February 5 with the 24 Hours of Daytona, and ended on November 5 with the Mexico City 250.

The 2005 season saw another reduction of classes for the fourth year in a row with the suppression of the Super Grand Sport (SGS) class after just one season. The format was thus reduced to two classes, Daytona Prototypes (DP) and Grand Touring (GT).