| December | Vodacom ISRS 1998
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round 08, South Africa, 4 - 6 December 1998
Vodacom ISRS held on 4 - 6 December 1998 at Kyalami Grand Prix Circuit in South Africa with nineteen entries and results as part of 1998 International Sports Racing Series. | More |
| November | Vallelunga 6 Hours 1998
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round 05, Italy, 15 November 1998
Vallelunga 6 Hours held on 15 November 1998 at ACI Vallelunga Circuit in Italy with five entries and results as part of 1998 Campionato Italiano Supercar GT. | More |
| October | Visa Sports Car Championships 1998
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round 10, United States, 23 - 25 October 1998
Visa Sports Car Championships held on 23 - 25 October 1998 at Laguna Seca in United States with twenty nine entries and results as part of 1998 FIA GT Championship. | More |
| October | Homestead 500km 1998
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round 09, United States, 17 - 18 October 1998
Homestead 500km held on 17 - 18 October 1998 at Homestead-Miami Speedway in United States with twenty seven entries and results as part of 1998 FIA GT Championship. | More |
| September | Coupe d'Automne 1998
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round 07, France, 19 - 20 September 1998
Coupe d'Automne held on 19 - 20 September 1998 at Circuit permanent Bugatti in France with twenty six entries and results as part of 1998 International Sports Racing Series. | More |
| September | Zeltweg 500km 1998
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round 08, Austria, 18 - 20 September 1998
Zeltweg 500km held on 18 - 20 September 1998 at A1-Ring in Austria with thirty entries and results as part of 1998 FIA GT Championship. | More |
| September | DMC-ADAC Sportwagen Festival 1998
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round 06, Germany, 4 - 6 September 1998
DMC-ADAC Sportwagen Festival held on 4 - 6 September 1998 at Nurburgring in Germany with twenty five entries and results as part of 1998 International Sports Racing Series. | More |
| September | Donington 500km 1998
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round 07, United Kingdom, 4 - 6 September 1998
Donington 500km held on 4 - 6 September 1998 at Donington Park Racing Circuit in United Kingdom with twenty eight entries and results as part of 1998 FIA GT Championship. | More |
| August | Suzuka 1000km 1998
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round 06, Japan, 21 - 23 August 1998
Suzuka 1000km held on 21 - 23 August 1998 at Suzuka International Racing Course in Japan with twenty three entries and results as part of 1998 FIA GT Championship. | More |
| August | Sweden, 15 - 16 August 1998
International Sports Racing Series Anderstorp held on 15 - 16 August 1998 at Scandinavian Raceway in Sweden with seventeen entries and results as part of 1998 International Sports Racing Series. | More |
| July | RAC Tourist Trophy 1998
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round 04, United Kingdom, 18 - 19 July 1998
RAC Tourist Trophy held on 18 - 19 July 1998 at Donington Park Racing Circuit in United Kingdom with twenty two entries and results as part of 1998 International Sports Racing Series. | More |
| July | Budapest 500km 1998
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round 05, Hungary, 17 - 19 July 1998
Budapest 500km held on 17 - 19 July 1998 at Hungaroring in Hungary with thirty two entries and results as part of 1998 FIA GT Championship. | More |
| July | Dijon 500km 1998
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round 04, France, 11 - 12 July 1998
Dijon 500km held on 11 - 12 July 1998 at Circuit de Dijon-Prenois in France with twenty eight entries and results as part of 1998 FIA GT Championship. | More |
| July | Giesse ISRS Trophy 1998
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round 03, Italy, 4 - 5 July 1998
Giesse ISRS Trophy held on 4 - 5 July 1998 at Autodromo Internazionale 'Santa Monica' di Misano Adriatico in Italy with twenty four entries and results as part of 1998 International Sports Racing Series. | More |
| June | Hockenheim 500km 1998
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round 03, Germany, 26 - 28 June 1998
Hockenheim 500km held on 26 - 28 June 1998 at Hockenheimring in Germany with thirty entries and results as part of 1998 FIA GT Championship. | More |
| June | Zeltweg 2 Hours 1998
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round 04, Belgium, 21 June 1998
Zeltweg 2 Hours held on 21 June 1998 at A1-Ring in Belgium as part of 1998 Campionato Italiano Supercar GT. | |
| June | France, 6 - 7 June 1998
66. edition des 24 Heures du Mans held on 6 - 7 June 1998 at Circuit de la Sarthe in France with fourty seven entries and results. | More |
| May | Misano 6 Hours 1998
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round 03, Italy, 23 May 1998
Misano 6 Hours held on 23 May 1998 at Autodromo Internazionale 'Santa Monica' di Misano Adriatico in Italy as part of 1998 Campionato Italiano Supercar GT. | |
| May | Brno 2.5 hour 1998
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round 02, Czech Republic, 16 - 17 May 1998
Brno 2.5 hour held on 16 - 17 May 1998 at Automotodrom Masaryk in Czech Republic with eighteen entries and results as part of 1998 International Sports Racing Series. | More |
| May | British Empire Trophy 1998
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round 02, United Kingdom, 15 - 17 May 1998
British Empire Trophy held on 15 - 17 May 1998 at Silverstone Circuit in United Kingdom with twenty nine entries and results as part of 1998 FIA GT Championship. | More |
| May | Italy, 13 - 16 May 1998
Mille Miglia held on 13 - 16 May 1998 in Italy with thirty six entries. | More |
| May | France, 3 May 1998
Essais Preliminaires des 24 Heures du Mans 1998 held on 3 May 1998 at Circuit de la Sarthe in France with four entries and results. | More |
| April | Paul Ricard 4 Hours 1998
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round 02, France, 26 April 1998
Paul Ricard 4 Hours held on 26 April 1998 at ASA Circuit Paul Ricard, Circuit du Castellet in France as part of 1998 Campionato Italiano Supercar GT. | |
| April | France, 14 - 18 April 1998
Tour Auto held on 14 - 18 April 1998 in France with two hundred fourteen entries and results. | More |
| April | France, 11 - 13 April 1998
International Sports Racing Series Paul Ricard held on 11 - 13 April 1998 at ASA Circuit Paul Ricard, Circuit du Castellet in France with fifteen entries and results as part of 1998 International Sports Racing Series. | More |
| April | Oschersleben 500km 1998
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round 01, Germany, 10 - 12 April 1998
Oschersleben 500km held on 10 - 12 April 1998 at Motorsport Arena Oschersleben in Germany with twenty six entries and results as part of 1998 FIA GT Championship. | More |
| March | Monza 1000km 1998
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round 01, Italy, 29 March 1998
Monza 1000km held on 29 March 1998 at Autodromo Nazionale di Monza in Italy with six entries and results as part of 1998 Campionato Italiano Supercar GT. | More |