The 1966 Rothmans 12 Hour International Sports Car Race was an endurance motor race for Sports Racing Cars, Improved Production Cars and Series Production Cars. The event was held at the Surfers Paradise International Raceway in Queensland, Australia on 21 August 1966.
| Position | Drivers | No. | Car | Entrant | Laps |
| 1 | Jackie Stewart, Andrew Buchanan | 3 | Ferrari 250LM | Scuderia Veloce | 493 |
|---|---|---|---|---|---|
| 2 | Peter Sutcliffe, Frank Matich | 2 | Ford GT40 | Peter Sutcliffe Racing | 492 |
| 3 | Kevin Bartlett, Doug Chivas | 9 | Alfa Romeo GTZ-2 | Alec Mildren Racing | 471 |
| 4 | Alan Hamilton, Brian Reed | 8 | Porsche Spyder | Porsche Distributors | 451 |
| 5 | Jack Epstein, Paul Hawkins | 4 | Ferrari 250LM | Epstein Enterprises | 441 |
| 6 | Brian Foley, John French | Morris Cooper S | BMC (Australia) | 437 | |
| Sports Racing Over 2000cc | |||||
| 1 | Jackie Stewart, Andrew Buchanan | 3 | Ferrari 250LM | Scuderia Veloce | 493 |
| 2 | Peter Sutcliffe, Frank Matich | 2 | Ford GT40 | Peter Sutcliffe Racing | 492 |
| 3 | Jack Epstein, Paul Hawkins | 4 | Ferrari 250LM | Epstein Enterprises | 441 |
| 4 | Bill Ford, G Lister, D Seldon | Volvo 122S | British & Continental Cars | 273 | |
| 5 | Ray Morris, Laurie Stewart | 7 | Ford Falcon V8 | Ray Morris Motors | 216 |
| 6 | Tony Osborne, Murray Carter, Gibbs | 5 | Monaco Oldsmobile | 96 | |
| 7 | David Piper, Richard Attwood | 1 | Ferrari 365 P2 | 45 | |
| Sports Racing 0-2000cc | |||||
| 1 | Kevin Bartlett, Doug Chivas | 9 | Alfa Romeo GTZ-2 | Alec Mildren Racing | 471 |
| 2 | Alan Hamilton, Brian Reed | 8 | Porsche Spyder | Porsche Distributors | 451 |
| 3 | Brian Foley, John French | Morris Cooper S | BMC (Australia) | 437 | |
| 4 | Frank Demuth, John Harvey | 10 | Lotus 23b | RS Phillips | 408 |
| 5 | K Stacey, B McIntyre, M Henderson | Morris Cooper S | Marque Motors | 402 | |
| 6 | Bailey | Prince Skyline GT | 389 | ||
| 7 | Charlie Smith, Barry Seton | 15 | Morris Sports | 311 | |
| 8 | Gorringe | Lola | 54 | ||
| 9 | Thurston, Roddy, Rowe | Nota Clubman | Pitstop Car Sales | 48 | |
| Improved Production Over 2000cc | |||||
| 1 | Ron Thorpe, Tom Sulman | AC Cobra | Ron Thorpe | 420 | |
| 2 | Brian Lawler, H Gapps | Daimler SP250 | Brian Lawler | 372 | |
| 3 | R Bond, D Cooke, W Stanley | Austin-Healey 3000 | BP Castlecove | 358 | |
| Improved Production 0-2000cc | |||||
| 1 | David McKay, Bill Brown | 22 | Volvo P1800S | Scuderia Veloce | 427 |
| 2 | John Roxburgh, Doug Whiteford, E Colwell | Datsun Fairlady 1600 | Datsun Australia | 424 | |
| 3 | R Booty, W Jamieson | Austin-Healey Sprite | R Booty | 397 | |
| 4 | N Riley, F Gibson | Honda S600 | Campbell Scot | 397 | |
| 5 | Errol Sakzewski, H Woelders, G Sekzewski | Porsche Carrera | DGD Sekzewski | 386 | |
| 6 | Austin-Healey Sprite | 376 | |||
| 7 | Austin-Healey Sprite | 330 | |||
| 8 | Austin-Healey Sprite | 195 | |||
| 9 | Austin-Healey Sprite | 195 | |||
| 10 | MGA Twin Cam | 142 | |||
| 11 | Max Stewart, Young | Triumph Spitfire | 69 | ||
| Series Production Over 2000cc | |||||
| 1 | Bryan Thomson, Glyn Scott | Jaguar E-Type | Shepparton Truck Sales | 418 | |
| Series Production 0-2000cc | |||||
| 1 | J Quinn, P Mander | Lotus Elan S2 | HQ Performance Motors | 418 | |
| 2 | R Holden, J Underwood, J Collins | 39 | MGB | Everybody's Magazine | 406 |
| 3 | Colin Bond, Barry Ferguson, A Treloar | Isuzu Bellett GT | Griffon Motors | 402 | |
| 4 | Barry Tapsall, W Gates | Datsun SSS | Barry Tapsall | 399 | |
| 5 | J Maroulis, I Ferguson | Lotus Elan | Cominos Pharmacy | 375 | |
| 6 | Sedaitis | Morgan +4 SS | 372 | ||
| 7 | Leffler, Carne | Austin-Healey Sprite | 229 | ||
| 8 | Honda S600 | 227 | |||