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. In C2-class 12 different drivers competed, but none of them for the whole season. The Toyota Atlantic Championship Presented by Yokohama Drivers' Champion was Charles Zwolsman Jr. driving for Condor Motorsports.
| Team | No | Drivers | Races |
|---|---|---|---|
| Class 1 | |||
| Jensen MotorSport | 2 |  Adam Pecorari | 2 |
 Leonardo Maia | 5-6 | ||
 Eric Jensen | 7-8, 12 | ||
| Ryan Spencer-Smith | 9-10 | ||
| Christopher Prey | 11 | ||
| 22 | Grant Ryley | 9 | |
| Polestar Racing Group | 3 | Antoine Bessette | All |
| 12 |  Katherine Legge | All | |
| Team Tonis | 6 |  Tõnis Kasemets | All |
| US RaceTronics | 7 |  David Martínez | 2-12 |
| Brooks Associates Racing | 8 |  Andreas Wirth | 1-10 |
| 10 | Fernando Rees | 1 | |
| Memo Rojas | 2 | ||
| Al Unser III | 3-12 | ||
| Condor Motorsports | 11 | Charles Zwolsman Jr. | All |
| 41 | Phil Giebler | 9 | |
| Norcold Dyson Racing | 16 | Chris Dyson | 1, 3-6 |
| McAtee Motorsports | 19 | Brian McAtee | 1, 3-4, 9-10 |
| 24 | Kyle Kelley | 1-4, 9-12 | |
| Blackforest Motorsports | 23 | Tom Nastasi | 5-7 |
| PR1 Motorsports | 27 | Alan Sciuto | 9-11 |
| The Room Store | 49 | Dan Selznick | 1, 3-6, 9-10, 12 |
| Armsup Motorsports | 54 | Daniel Di Leo | 11 |
| 55 | Chris Menninga | 11 | |
| Bite Racing | 56 | Chris Souliotis | 3-12 |
| Blackforest Motorsports | 96 | Ben Johnston | 1-2 |
| Class 2 | |||
| P-1 Racing | 5 | Rocky Moran Jr. | 1 |
| Team Tonis | 9 | Dan Cobb | 1-10 |
| Bobby Wilson | 11 | ||
| Binder Racing | 15 | Justin Sofio | 1 |
| Mathiasen Motorsports | 15 | Justin Sofio | 3-10 |
| RJS Motorsports | 18 | Bob Siska | 1, 3-12 |
| Blackjack Racing | 21 | Roger Glover | 3-4, 8 |
| Blackforest Motorsports | 23 | Tom Nastasi | 1-2 |
| Condor Motorsports | 31 | Tim Hauraney | 3-4, 7 |
| US RaceTronics | 32 | Roby Feazell | 1 |
| Atkins Racing | 48 | Lee Atkins | 1, 3-4, 9-12 |
| Bite Racing | 63 | Daryl Leiski | 3-12 |
| Comprent Motorsports | 66 | Rich Zober | 5-6 |
| Ishikawa Racing | 71 | Mark Ishikawa | 1-4, 9 |
Note:
Race 3, 4, 5 and 6 only one additional point awarded to the fastest qualifier, because only one session was held for each race.
In all races not all points were awarded (not enough competitors).
See also: List of American Championship car racing point scoring systems.
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