| 1999 · 1999 24 Hours of Le Mans | DNF | 2 | LM-GTP | Toyota Motorsport GmbH | Allan McNish · Thierry Boutsen · Ralf KellenersAllan McNish Thierry Boutsen Ralf Kelleners | Toyota GT-One | Toyota R36V 3.6L V8 twin turbo | 173 | Wikipedia contributors · CC BY-SA 4.0 |
| 1998 · 1998 24 Hours of Le Mans | DNF | 29 | LM-GT1 | Toyota Motorsport GmbH | Geoff Lees · Thierry Boutsen · Ralf KellenersGeoff Lees Thierry Boutsen Ralf Kelleners | Toyota GT-One | Toyota R36V 3.6L V8 twin turbo | 330 | Wikipedia contributors · CC BY-SA 4.0 |
| 1997 · 1997 24 Hours of Le Mans | DNF | 25 | LM-GT1 * | Porsche AG | Hans-Joachim Stuck · Bob Wollek · Thierry BoutsenHans-Joachim Stuck Bob Wollek Thierry Boutsen | Porsche 911 GT1 Evo | Porsche 9R1 3.2L F6 twin turbo | 238 | Wikipedia contributors · CC BY-SA 4.0 |
| 1996 · 1996 24 Hours of Le Mans | 2 | 25 | LM-GT1 | Porsche AG | Hans-Joachim Stuck · Thierry Boutsen · Bob WollekHans-Joachim Stuck Thierry Boutsen Bob Wollek | Porsche 911 GT1 | Porsche 9R1 3.2L F6 twin turbo | 353 | Wikipedia contributors · CC BY-SA 4.0 |
| 1995 · 1995 24 Hours of Le Mans | 6 | 4 | LM-WSC | Kremer Racing | Hans-Joachim Stuck · Thierry Boutsen · Christophe BouchutHans-Joachim Stuck Thierry Boutsen Christophe Bouchut | Kremer K8 | Porsche 935/76 3.0L F6 twin turbo | 289 | Wikipedia contributors · CC BY-SA 4.0 |
| 1994 · 1994 24 Hours of Le Mans | 3 | 35 | LM-GT1 | Le Mans Porsche Team | Hans-Joachim Stuck · Danny Sullivan · Thierry BoutsenHans-Joachim Stuck Danny Sullivan Thierry Boutsen | Dauer 962 Le Mans | Porsche 935/82 3.0L F6 twin turbo | 343 | Wikipedia contributors · CC BY-SA 4.0 |
| 1993 · 1993 24 Hours of Le Mans | 2 | 1 | Category 1 | Peugeot Talbot Sport | Thierry Boutsen · Yannick Dalmas · Teo FabiThierry Boutsen Yannick Dalmas Teo Fabi | Peugeot 905 Evo 1C | Peugeot SA35 3.5L V10 | 374 | Wikipedia contributors · CC BY-SA 4.0 |
| 1986 · 1986 24 Hours of Le Mans | DNF | 19 | Gr.C1 | Brun Motorsport | Thierry Boutsen · Didier Theys · Alain FertéThierry Boutsen Didier Theys Alain Ferté | Porsche 956 | Porsche 935/79 2.6L F6 twin turbo | 89 | Wikipedia contributors · CC BY-SA 4.0 |
| 1986 · Coppa Kouros, Monza | 5 | 17 | 5. C1 | Brun Motorsport | Thierry Boutsen · Drake Olson | Porsche 962C | — | 60 | WSPR historical record |
| 1986 · Kouros' 1000 km Silverstone | 11 | 17 | 1. C1 | Brun Motorsport | Thierry Boutsen · Massimo Sigala | Porsche 962C | — | 200 | WSPR historical record |
| 1986 · 100 Meilen von Nürnberg, Norisring | 10 | 18 | 9. C1 | Brun Motorsport | Thierry Boutsen | Porsche 956 | — | 76 | WSPR historical record |
| 1986 · Shell Gemini 1000 km Brands Hatch | 3 | 19 | 3. C1 | Brun Motorsport | Thierry Boutsen · Frank Jelinski | Porsche 956 | — | 231 | WSPR historical record |
| 1986 · ADAC Kouros 1000 km Nürburgring | retired | 17 | C1 | Brun Motorsport | Thierry Boutsen · Walter Brun | Porsche 962C | — | 22 | WSPR historical record |
| 1986 · Kouros 1000 Kilometres Spa | 1 | 17 | 1. C1 | Brun Motorsport | Thierry Boutsen · Frank Jelinski · DNS - Walter Brun | Porsche 962C | — | 145 | WSPR historical record |
| 1985 · 1000 km Mugello | 3 | 19 | 3. C1 | Brun Motorsport | Stefan Bellof · Thierry Boutsen | Porsche 962C | — | 189 | WSPR historical record |
| 1985 · Trofeo Filippo Caracciolo, Monza | disqualified | 19 | C1 | Brun Motorsport | Thierry Boutsen · Stefan Bellof | Porsche 962C | — | 138 | WSPR historical record |
| 1985 · Silverstone 1000 Kilometres | 10 | 19 | 9. C1 | Brun Motorsport | Thierry Boutsen · Walter Brun | Porsche 962C | — | 193 | WSPR historical record |
| 1985 · Duschfrish ADAC 1000 Kilometres, Hockenheim | retired | 19 | C1 | Brun Motorsport | Stefan Bellof · Thierry Boutsen | Porsche 956 | — | 99 | WSPR historical record |
| 1985 · 1000 km Spa | retired | 19 | C1 | Brun Motorsport | Thierry Boutsen · Stefan Bellof | Porsche 956 | — | 77 | WSPR historical record |
| 1984 · Trofeo Filippo Caracciolo, Monza | retired | 33 | C1 | John Fitzpatrick Racing | Thierry Boutsen · David Hobbs | Porsche 956 | — | 87 | WSPR historical record |
| 1984 · Sandown Park 1000 Kilometres | retired | 33 | C1 | John Fitzpatrick Racing | Thierry Boutsen · David Hobbs | Porsche 956 | — | 171 | WSPR historical record |
| 1984 · Grand Prix International 1000 Kilometres, Silverstone | 8 | 33 | 8. C1 | John Fitzpatrick Racing | Thierry Boutsen · David Hobbs | Porsche 956 | — | 199 | WSPR historical record |
| 1984 · ADAC 1000 Kilometres, Nürburgring | 2 | 33 | 2. C1 | Skoal Bandit Porsche Team | Thierry Boutsen · David Hobbs | Porsche 956 | — | 207 | WSPR historical record |
| 1984 · British Aerospace 1000 Kilometres, Brands Hatch | source_section_running_in_practice | 33T | C1 | John Fitzpatrick Racing | David Hobbs · Thierry Boutsen | Porsche 956 | — | | WSPR historical record |
| 1984 · British Aerospace 1000 Kilometres, Brands Hatch | 3 | 55 | 3. C1 | John Fitzpatrick Racing | Guy Edwards · Rupert Keegan · Thierry Boutsen | Porsche 962 | — | 234 | WSPR historical record |
| 1984 · British Aerospace 1000 Kilometres, Brands Hatch | 6 | 33 | 6. C1 | John Fitzpatrick Racing | Thierry Boutsen · David Hobbs · Guy Edwards | Porsche 956 | — | 222 | WSPR historical record |
| 1984 · Rothmans Spa 1000 Kilometres, Spa | retired | 33 | C1 | John Fitzpatrick Racing | Thierry Boutsen · David Hobbs | Porsche 956 | — | 129 | WSPR historical record |
| 1984 · 1000 Kilometres di Imola | retired | 33 | C1 | John Fitzpatrick Racing | Thierry Boutsen · David Hobbs | Porsche 956 | — | 14 | WSPR historical record |
| 1984 · Mount Fuji 1000 Kilometres | entry_only | 33 | C1 | John Fitzpatrick Racing | David Hobbs · Thierry Boutsen | Porsche 956 | — | | WSPR historical record |
| 1983 · 1983 24 Hours of Le Mans | DNF | 24 | Gr.C | Ford Concessionaires France | Henri Pescarolo · Thierry BoutsenHenri Pescarolo Thierry Boutsen | Rondeau M482 | Cosworth DFL 4.0L V8 | 174 | Wikipedia contributors · CC BY-SA 4.0 |
| 1983 · Trofeo Filippo Caracciolo, Monza | 1 | 11 | 1. C | Joest Racing | Bob Wollek · Thierry Boutsen | Porsche 956 | — | 173 | WSPR historical record |
| 1983 · Grand Prix International 1000 Kilometres, Silverstone | 3 | 14 | 3. C | Richard Lloyd Racing | Jan LAMMERS · Richard Lloyd · Thierry Boutsen | Porsche 956 | — | 205 | WSPR historical record |
| 1983 · Trophee Diners Club 1000 Kilometres, Spa-Francorchamps | 9 | 14 | 9. C | Richard Lloyd Racing | Jan LAMMERS · Thierry Boutsen | Porsche 956 | — | 127 | WSPR historical record |
| 1983 · Mount Fuji 1000 Kilometres | 4 | 3 | 4. C | Matsuda Conection | Henri Pescarolo · Thierry Boutsen | Porsche 956 | — | 218 | WSPR historical record |
| 1983 · Castrol 1000 km Kyalami | retired | 11 | C | John Fitzpatrick Racing | Thierry Boutsen · Desiré Wilson · David Hobbs | Porsche 956 | — | 47 | WSPR historical record |
| 1982 · Trophee Diners Club 1000 kilometres, Spa-Francorchamps | retired | 12 | C | Automobiles Jean Rondeau | Thierry Boutsen · Henri Pescarolo | Rondeau M382 Ford | — | 28 | WSPR historical record |
| 1982 · WEC in Japan, Fuji Speedway | retired | 3 | C | Italya Sport | Henri Pescarolo · Thierry Boutsen | Rondeau M382C Ford | — | 250 | WSPR historical record |
| 1981 · 1981 24 Hours of Le Mans | DNF | 82 | Gr.C | WM AEREM | Thierry BoutsenThierry Boutsen Serge Saulnier Michel Pignard | WM P81 | Peugeot PRV ZNS4 2.7L V6 twin-turbo | 15 | Wikipedia contributors · CC BY-SA 4.0 |