| Runda | Tor | Data | Kierowca | Pojazd | Zespół |
|---|---|---|---|---|---|
| 1 |  Daytona Daytona 24 godziny | 1981.01.31 - 02.01 | Porsche 935 K3 |  Garretson Racing | |
| 2 | Sebring Sebring 12 godzin | 1981.03.21 | Porsche 935/80 | Bayside Disposal Racing | |
| 3 |  Mugello | 1981.04.12 | Osella PA9 - BMW | Osella Squadra Corse | |
| 4 | Monza | 1981.04.26 | Porsche 935 K3 | Weralit Racing Team | |
| 5 | Riverside | 1981.04.26 | Porsche 935 K3/80 |  John Fitzpatrick Racing | |
| 6 | Silverstone | 1981.05.10 | Porsche 935J | Vegla Racing Team | |
| 7 |  Nürburgring | 1981.05.24 | BMW M1 Sauber | GS Tuning | |
| 8 |  Le Mans | 1981.06.13 - 06.14 | Porsche 936/81 | Porsche System | |
| 9 | Pergusa | 1981.06.28 | Lola T600 - Ford | Grid Team Lola | |
| 10 | Daytona | 1981.07.02 | Mazda RX-3 | Mandeville Racing | |
| 11 | Watkins Glen | 1981.07.12 | Porsche 935 K3 | Garretson Racing | |
| 12 |  Spa-Francorchamps | 1981.07.25 - 07.26 | Mazda RX-7 |  Mazda | |
| 13 |  Mosport Park | 1981.08.16 | Porsche 935 M16 | Meister Racing | |
| 14 | Elkhart Lake | 1981.08.23 | Porsche 935 M16 | Meister Racing | |
| 15 | Brands Hatch | 1981.09.27 | Lola T600 - Ford | Banco Occidental/Ultramar/Team Lola |
