The 2005 Stock Car Brasil season (known for commercial reasons as the 2005 Copa Nextel Stock Car season) was the 27th edition of the Stock Car Brasil Championship. The season started at the Interlagos Circuit on May 1 with the final race of the season being held at the same circuit on November 27.
The championship was won by Giuliano Losacco for the second year in succession; emerging victorious over Cacá Bueno by one point.
The following circuits hosted at least one round of the 2005 championship.
All drivers were Brazilian-registered, except Esteban Tuero, who raced under Argentine racing license.