The 1965 World Sportscar Championship season was the 13th season of FIA World Sportscar Championship racing. It featured the 1965 International Championship for GT Manufacturers and the 1965 International Trophy for GT Prototypes.[1] The season ran from 28 February 1965 to 19 September 1965 and comprised 20 races.
The International Championship for GT Manufacturers was contested by Grand Touring Cars in three engine capacity divisions. The Over 2000cc division was won by Shelby ahead of Ferrari, while Porsche prevailed in the 2000cc division and Abarth-Simca took the 1300cc division. The International Trophy for GT Prototypes was won by Ferrari, ahead of Porsche and Ford.
Although composed of 20 races, each class did not compete in all events. Some events were for one class, while others were combined events.
| Rnd | Race | Circuit or Location | Competitors | Date |
|---|---|---|---|---|
| 1 |  Continental 2000 km of Daytona | Daytona International Speedway | Both | 28 February |
| 2 | 12 Hours of Sebring | Sebring International Raceway | Both | 27 March |
| 3 |  Gran Premio Shell Coppa Bologna | Autodromo Dino Ferrari | GT | 11 April |
| 4 | Coppa Inter-Europa | Autodromo Nazionale Monza | GT | 25 April |
| 5 | 1000km Monza | Both | ||
| 6 |  RAC Senior Service Tourist Trophy | Oulton Park | Both | 1 May |
| 7 | Targa Florio | Circuito delle Madonie | Both | 9 May |
| 8 |  500km of Spa-Francorchamps | Circuit de Spa-Francorchamps | Both | 16 May |
| 9 |  Intl. ADAC 1000 Kilometres Rennen Nürburgring | Nürburgring | Both | 23 May |
| 10 | Mugello 500 km | Mugello Circuit | GT | 6 June |
| 11 | Internationaler Alpen-Bergpreis | Rossfeld road in Berchtesgaden Alps | GT | 13 June |
| 12 |  24 Hours of Le Mans | Circuit de la Sarthe | Both | 19 June 20 June |
| 13 | 12 Hours of Reims | Reims-Gueux | Both | 4 July |
| 14 | Corsa della Mendola | Bolzano | GT | 4 July |
| 15 | Bergpreis Freiburg-Schauinsland | Schauinsland | GT | 8 August |
| 16 | Coppa Citta di Enna | Autodromo di Pergusa | GT | 15 August |
| 17 |  Grosser Bergpreis der Schweiz | Villars | GT | 29 August |
| 18 | 500 km Nürburgring | Nürburgring | GT | 5 September |
| 19 | Double 500 km | Bridgehampton | GT2.0 | 19 September |
| 20 | Both |
| Position | Manufacturer | Points [4] | |
| Division 1 : 1300cc | |||
| 1 | Abarth-Simca | 67.5 | |
| 2 | MG | 41.5 | |
| 3 | Fiat-Abarth | 26.7 | |
| 4 | Alfa Romeo | 14.2 | |
| 5 | Alpine | 9.7 | |
| 6 | Triumph | 9.6 | |
| 7 | Lancia | 4.0 | |
| Austin | 4.0 | ||
| 9 | Lotus | 1.0 | |
| Marcos | 1.0 | ||
| Division 2 : 2000cc | |||
| 1 | Porsche | 96.3 | |
| 2 | Alfa Romeo | 45.2 | |
| 3 | MG | 19.8 | |
| 4 | Triumph | 8.0 | |
| 5 | Abarth-Simca | 7.0 | |
| 6 | Lotus | 5.8 | |
| 7 | Volvo | 3.9 | |
| Division 3 : Over 2000cc | |||
| 1 | Shelby | 90.0 | |
| 2 | Ferrari | 71.3 | |
| 3 | Austin-Healey | 8.1 | |
| 4 | Jaguar | 7.2 | |
| 5 | Chevrolet | 2.6 | |
| 6 | Sunbeam | 1.6 |
| Position | Manufacturer | Points | |
| 1 | Ferrari | 58.5 | |
| 2 | Porsche | 30.4 | |
| 3 | Ford | 19.6 | |
| 4 | Iso | 3.9 |
