This list of 2005 motorsport champions is a list of national or international auto racing series with a Championship decided by the points or positions earned by a driver from multiple races.
| Series | Driver | Season article |
|---|---|---|
| American Le Mans Series | LMP1: Frank Biela LMP1:  Emanuele Pirro | 2005 American Le Mans Series season |
LMP1 Teams:  ADT Champion Racing | ||
| LMP2: Clint Field | ||
| LMP2 Teams: Intersport Racing | ||
GT1:  Oliver GavinGT1:  Olivier Beretta | ||
| GT1 Teams: Corvette Racing | ||
| GT2: Patrick Long GT2: Jörg Bergmeister | ||
| GT2 Teams: Petersen/White Lightning | ||
| Le Mans Series | LMP1:  Jean-Christophe BoullionLMP1: Emmanuel Collard | 2005 Le Mans Series season |
| LMP1 Teams: Pescarolo Sport | ||
| LMP2: Gareth Evans | ||
| LMP2 Teams: Chamberlain-Synergy | ||
| GT1: Michele Bartyan GT1: Christian PescatoriGT1:  Toni Seiler | ||
| GT1 Teams: BMS Scuderia Italia | ||
| GT2: Xavier Pompidou GT2: Marc Lieb | ||
| GT2 Teams: Sebah Automotive | ||
| Rolex Sports Car Series | DP: Max Angelelli DP:  Wayne Taylor | 2005 Rolex Sports Car Series season |
| GT: Craig Stanton | ||
| FIA GT Championship | GT1: Gabriele Gardel | 2005 FIA GT Championship season |
| GT1 Teams: Vitaphone Racing Team | ||
| GT2: Marc Lieb GT2: Mike Rockenfeller | ||
| GT2 Teams: GruppeM Racing |
| Series | Driver | Season article | |
|---|---|---|---|
| World Touring Car Championship | Overall: Andy Priaulx | 2005 World Touring Car Championship season | |
| Teams: BMW | |||
| Independents: Marc Hennerici | |||
| V8 Supercars |  Russell Ingall | 2005 V8 Supercar Championship Series | |
| Clio Cup | |||
| Renault Clio Cup UK | Jonathan Adam | ||
| Series | Driver/Co-Driver | Season article |
|---|---|---|
| World Rally Championship | Sébastien Loeb Daniel Elena | 2005 World Rally Championship season |
| Manufacturer: Citroën | ||
| Junior World Rally Championship |  Dani Sordo | |
| Production World Rally Championship |  Toshi Arai |
Jari Koivisto
Cemil Çipa
Team Autotecnica