The 2005 Labour Day Weekend Grand Prix of Mosport was the eighth race for the 2005 American Le Mans Series season and the twentieth IMSA SportsCar Championship race at the facility. It took place on September 4, 2005. The race was won overall by Dyson Racing drivers Butch Leitzinger and James Weaver in a MG-Lola EX257.
Class winners in bold. Cars failing to complete 70% of winner's distance marked as Not Classified (NC).
| Pos | Class | No | Team | Drivers | Chassis | Tyre | Laps |
|---|---|---|---|---|---|---|---|
| Engine | |||||||
| 1 | LMP1 | 16 |  Dyson Racing | Butch Leitzinger  James Weaver | MG-Lola EX257 | M | 127 |
| MG (AER) XP20 2.0L Turbo I4 | |||||||
| 2 | LMP1 | 1 | ADT Champion Racing |  Marco Werner  JJ Lehto | Audi R8 | M | 127 |
| Audi 3.6L Turbo V8 | |||||||
| 3 | LMP1 | 2 | ADT Champion Racing | Frank Biela  Emanuele Pirro | Audi R8 | M | 126 |
| Audi 3.6L Turbo V8 | |||||||
| 4 | LMP1 | 20 | Dyson Racing | Chris Dyson Andy Wallace | MG-Lola EX257 | M | 125 |
| MG (AER) XP20 2.0L Turbo I4 | |||||||
| 5 | LMP2 | 37 | Intersport Racing | Clint Field Liz Halliday | Lola B05/40 | G | 120 |
| AER P07 2.0L Turbo I4 | |||||||
| 6 | GT1 | 4 | Corvette Racing | Oliver Gavin  Olivier Beretta | Chevrolet Corvette C6.R | M | 119 |
| Chevrolet 7.0L V8 | |||||||
| 7 | GT1 | 3 | Corvette Racing |  Ron Fellows Johnny O'Connell | Chevrolet Corvette C6.R | M | 119 |
| Chevrolet 7.0L V8 | |||||||
| 8 | GT1 | 63 | ACEMCO Motorsports | Terry Borcheller Johnny Mowlem | Saleen S7-R | M | 119 |
| Ford 7.0L V8 | |||||||
| 9 | GT1 | 35 | Maserati Corse Risi Competizione | Andrea Bertolini Fabrizio de Simone | Maserati MC12 | P | 118 |
| Maserati 6.0L V12 | |||||||
| 10 | LMP2 | 10 | Miracle Motorsports | Jeff Bucknum Chris McMurry | Courage C65 | K | 117 |
| AER P07 2.0L Turbo I4 | |||||||
| 11 | LMP2 | 8 | B-K Motorsports | Guy Cosmo James Bach | Courage C65 | G | 113 |
| Mazda R20B 2.0L 3-Rotor | |||||||
| 12 | GT1 | 71 | Carsport America | Michele Rugolo Tom Weickardt Jean-Philippe Belloc | Dodge Viper GTS-R | P | 112 |
| Dodge 8.0L V10 | |||||||
| 13 | GT2 | 31 | Petersen Motorsports White Lightning Racing | Patrick Long Jörg Bergmeister | Porsche 911 GT3-RSR | M | 110 |
| Porsche 3.6L Flat-6 | |||||||
| 14 | GT2 | 24 | Alex Job Racing | Ian Baas Darren Law | Porsche 911 GT3-RSR | M | 110 |
| Porsche 3.6L Flat-6 | |||||||
| 15 | GT2 | 43 | BAM! | Mike Rockenfeller Wolf Henzler | Porsche 911 GT3-RSR | Y | 109 |
| Porsche 3.6L Flat-6 | |||||||
| 16 | GT2 | 44 | Flying Lizard Motorsports | Lonnie Pechnik Seth Neiman | Porsche 911 GT3-RSR | M | 109 |
| Porsche 3.6L Flat-6 | |||||||
| 17 | GT2 | 79 | J3 Racing | Justin Jackson Tim Sugden | Porsche 911 GT3-RSR | P | 108 |
| Porsche 3.6L Flat-6 | |||||||
| 18 | GT2 | 23 | Alex Job Racing | Timo Bernhard Romain Dumas | Porsche 911 GT3-RSR | M | 108 |
| Porsche 3.6L Flat-6 | |||||||
| 19 | GT2 | 51 | Panoz Motor Sports | Bryan Sellers Marino Franchitti | Panoz Esperante GT-LM | P | 107 |
| Ford (Elan) 5.0L V8 | |||||||
| 20 DNF | GT2 | 50 | Panoz Motor Sports | Bill Auberlen Robin Liddell | Panoz Esperante GT-LM | P | 91 |
| Ford (Elan) 5.0L V8 | |||||||
| 21 DNF | GT2 | 45 | Flying Lizard Motorsports | Johannes van Overbeek Jon Fogarty | Porsche 911 GT3-RSR | M | 68 |
| Porsche 3.6L Flat-6 | |||||||
| 22 DNF | LMP2 | 19 | Van der Steur Racing | Gunnar van der Steur Eric van der Steur Ben Devlin | Lola B2K/40 | D | 26 |
| Nissan (AER) 3.0L V6 | |||||||
| FINAL RACE RESULTS Archived 2014-08-08 at the Wayback Machine [1] | |||||||
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