The 2005 Toyota Atlantic Championship season was contested over 12 rounds.

14 different teams and 27 different drivers competed.

In this one-make formula all drivers had to utilize Swift chassis and Toyota engines.

This season also saw a C2-class running older Swift chassis and Toyota engines.

The Toyota Atlantic Championship Presented by Yokohama Drivers' Champion was Charles Zwolsman Jr. driving for Condor Motorsports.