| November | Campeonato de Espana de GT Barcelona 2003
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round 06, Spain, 9 November 2003
Campeonato de Espana de GT Barcelona held on 9 November 2003 at Circuit de Catalunya in Spain as part of 2003 International GT Open. | |
| October | Italy, 18 - 19 October 2003
FIA GT Championship Monza held on 18 - 19 October 2003 at Autodromo Nazionale di Monza in Italy with fourty entries and results as part of 2003 FIA GT Championship. | More |
| October | Campeonato de Espana de GT Jerez 2003
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round 05, Spain, 12 October 2003
Campeonato de Espana de GT Jerez held on 12 October 2003 at Circuito Permanente de Jerez in Spain as part of 2003 International GT Open. | |
| October | Portugal, 4 - 5 October 2003
FIA GT Championship Estoril held on 4 - 5 October 2003 at Autodromo do Estoril in Portugal with thirty two entries and results as part of 2003 FIA GT Championship. | More |
| September | FIA Sportscar Championship Paul Armagnac 2003
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round 07, France, 21 September 2003
FIA Sportscar Championship Paul Armagnac held on 21 September 2003 at Circuit Paul Armagnac in France with seven entries and results as part of 2003 International Sports Racing Series. | More |
| September | Germany, 21 September 2003
FIA GT Championship Oschersleben held on 21 September 2003 at Motorsport Arena Oschersleben in Germany with thirty two entries and results as part of 2003 FIA GT Championship. | More |
| September | Campeonato de Espana de GT Valencia 2003
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round 04, Spain, 14 September 2003
Campeonato de Espana de GT Valencia held on 14 September 2003 at Circuit de Valencia 'Ricardo Tormo' in Spain as part of 2003 International GT Open. | |
| September | Sweden, 7 September 2003
FIA GT Championship Anderstorp held on 7 September 2003 at Scandinavian Raceway in Sweden with thirty entries and results as part of 2003 FIA GT Championship. | More |
| August | 1000km de Spa-Francorchamps 2003
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round 06, Belgium, 29 - 31 August 2003
1000km de Spa-Francorchamps held on 29 - 31 August 2003 at Circuit de Spa-Francorchamps in Belgium with thirty five entries and results as part of 2003 International Sports Racing Series. | More |
| August | FIA Sportscar Championship Donington Park 2003
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round 05, United Kingdom, 10 August 2003
FIA Sportscar Championship Donington Park held on 10 August 2003 at Donington Park Racing Circuit in United Kingdom with sixteen entries and results as part of 2003 International Sports Racing Series. | More |
| July | Proximus 24 Hours of Spa 2003
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round 06, Belgium, 26 - 27 July 2003
Proximus 24 Hours of Spa held on 26 - 27 July 2003 at Circuit de Spa-Francorchamps in Belgium with fifty five entries and results as part of 2003 FIA GT Championship. | More |
| July | FIA Sportscar Championship Oschersleben 2003
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round 04, Germany, 20 July 2003
FIA Sportscar Championship Oschersleben held on 20 July 2003 at Motorsport Arena Oschersleben in Germany with nine entries and results as part of 2003 International Sports Racing Series. | More |
| July | Campeonato de Espana de GT Estoril 2003
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round 03, Portugal, 6 July 2003
Campeonato de Espana de GT Estoril held on 6 July 2003 at Autodromo do Estoril in Portugal as part of 2003 International GT Open. | |
| June | Gran Premio Lotteria 2003
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round 03, Italy, 29 June 2003
Gran Premio Lotteria held on 29 June 2003 at Autodromo Nazionale di Monza in Italy with fifteen entries and results as part of 2003 International Sports Racing Series. | More |
| June | LG Super Racing Weekend Donington Park 2003
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round 05, United Kingdom, 28 - 29 June 2003
LG Super Racing Weekend Donington Park held on 28 - 29 June 2003 at Donington Park Racing Circuit in United Kingdom with thirty two entries and results as part of 2003 FIA GT Championship. | More |
| June | France, 14 - 15 June 2003
71. edition des 24 Heures du Mans held on 14 - 15 June 2003 at Circuit de la Sarthe in France with fifty entries and results. | More |
| May | Czech Republic, 24 - 25 May 2003
FIA GT Championship Brno held on 24 - 25 May 2003 at Automotodrom Masaryk in Czech Republic with thirty three entries and results as part of 2003 FIA GT Championship. | More |
| May | Italy, 22 - 24 May 2003
Mille Miglia held on 22 - 24 May 2003 at Piazza della Vittoria in Italy with twenty eight entries. | More |
| May | Campeonato de Espana de GT Jarama 2003
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round 02, Spain, 18 May 2003
Campeonato de Espana de GT Jarama held on 18 May 2003 at Circuito del Jarama in Spain as part of 2003 International GT Open. | |
| May | Italy, 11 May 2003
FIA GT Championship Pergusa held on 11 May 2003 at Autodromo di Pergusa in Italy with thirty one entries and results as part of 2003 FIA GT Championship. | More |
| May | FIA Sportscar Championship Lausitzring 2003
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round 02, Germany, 9 - 11 May 2003
FIA Sportscar Championship Lausitzring held on 9 - 11 May 2003 at EuroSpeedway Lausitz in Germany with eight entries and results as part of 2003 International Sports Racing Series. | More |
| April | Campeonato de Espana de GT Albacete 2003
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round 01, Spain, 27 April 2003
Campeonato de Espana de GT Albacete held on 27 April 2003 at Circuito de Albacete in Spain as part of 2003 International GT Open. | |
| April | LG Super Racing Weekend Magny-Cours 2003
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round 02, France, 27 April 2003
LG Super Racing Weekend Magny-Cours held on 27 April 2003 at Circuit de Nevers-Magny Cours in France with thirty seven entries and results as part of 2003 FIA GT Championship. | More |
| April | Italy, 25 - 27 April 2003
Concorso d'Eleganza Villa d'Este held on 25 - 27 April 2003 at Villa d'Este in Italy with sixty five entries. | More |
| April | FIA Sportscar Championship Estoril 2003
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round 01, Portugal, 13 April 2003
FIA Sportscar Championship Estoril held on 13 April 2003 at Autodromo do Estoril in Portugal with twelve entries and results as part of 2003 International Sports Racing Series. | More |
| April | France, 7 - 12 April 2003
Tour Auto held on 7 - 12 April 2003 in France with two hundred eight entries and results. | More |
| April | LG Super Racing Weekend Barcelona 2003
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round 01, Spain, 4 - 6 April 2003
LG Super Racing Weekend Barcelona held on 4 - 6 April 2003 at Circuit de Catalunya in Spain with thirty seven entries and results as part of 2003 FIA GT Championship. | More |