The 1984 Budweiser GT 1000 Kilometers was the sixth round of the 1984 World Endurance Championship. It took place at Mosport Park, Canada on 5 August 1984.
Several World Championship competitors opted not to participate in the Mosport round, including all B class entries. Three GTO class cars from the IMSA GT Championship chose to enter the round.
Class winners in bold. Cars failing to complete 75% of the winner's distance marked as Not Classified (NC).
| Pos | Class | No | Team | Drivers | Chassis | Tyre | Laps |
|---|---|---|---|---|---|---|---|
| Engine | |||||||
| 1 | C1 | 1 |  Rothmans Porsche | Jochen Mass  Jacky Ickx | Porsche 956 | D | 253 |
| Porsche Type-935 2.6 L Turbo Flat-6 | |||||||
| 2 | C1 | 33 |  Skoal Bandit Porsche Team John Fitzpatrick Racing | David Hobbs Rupert Keegan  Franz Konrad | Porsche 956B | G | 245 |
| Porsche Type-935 2.6 L Turbo Flat-6 | |||||||
| 3 | C2 | 81 |  Jolly Club | Almo Coppelli Guido Daccò | Alba AR2 | A | 229 |
| Giannini Carma FF 1.9 L Turbo I4 | |||||||
| 4 | C1 | 2 | Rothmans Porsche | Stefan Bellof Derek Bell | Porsche 956 | D | 221 |
| Porsche Type-935 2.6 L Turbo Flat-6 | |||||||
| 5 | C2 | 82 | Maurizio Gellini | Maurizio Gellini Gerardo Vatielli Pasquale Barberio | Alba AR3 | ? | 217 |
| Ford Cosworth DFL 3.3 L V8 | |||||||
| 6 | C2 | 80 | Jolly Club | Martino Finotto Alfredi Sebastiani Carlo Facetti | Alba AR2 | A | 204 |
| Giannini Carma FF 1.9 L Turbo I4 | |||||||
| 7 | C2 | 99 | J.Q.F. Engineering Ltd. | Jeremy Rossiter Roy Baker Peter Lockhart | Tiga GC284 | A | 185 |
| Ford Cosworth BDT 1.8 L Turbo I4 | |||||||
| 8 NC | C1 | 20 | Porsche Kremer Racing | Bill Adam  Kees Nierop George Fouché | Porsche 956 | G | 159 |
| Porsche Type-935 2.6 L Turbo Flat-6 | |||||||
| 9 NC | C1 | 3 | Rothmans Porsche |  Vern Schuppan Nick Mason | Porsche 956 | D | 156 |
| Porsche Type-935 2.6 L Turbo Flat-6 | |||||||
| 10 DNF | C2 | 84 | Lyncar Motorsport Ltd. |  Costas Los Allen Berg | Lyncar MS83 | A | 206 |
| Ford Cosworth DFV 3.0 L V8 | |||||||
| 11 DNF | C1 | 19 |  Brun Motorsport | Walter Brun  Oscar Larrauri | Porsche 956 | D | 204 |
| Porsche Type-935 2.6 L Turbo Flat-6 | |||||||
| 12 DNF | IMSA GTO | 40 | Bieri Racing | Uli Bieri Matt Gysler | BMW M1 | G | 190 |
| BMW M88/1 3.5 L I6 | |||||||
| 13 DNF | IMSA GTO | 65 | English Enterprizes | Gary English Mike Laws | Chevrolet Camaro | ? | 156 |
| Chevrolet V8 | |||||||
| 14 DNF | C1 | 21 | Charles Ivey Racing | Barry Robinson Dudley Wood | Grid S2 | A | 127 |
| Porsche Type-935 2.9 L Turbo Flat-6 | |||||||
| 15 DNF | C2 | 73 | Gebhardt Motorsport | John Graham George Schwarz | Gebhardt JC843 | A | 40 |
| Ford Cosworth DFV 3.0 L V8 | |||||||
| 16 DNF | IMSA GTO | 60 | Alps Restoration | Peter Aschenbrenner Mike Freberg | Audi 80 | ? | 12 |
| Audi 2.2 L I5 | |||||||
| DNS | C1 | 55 | Skoal Bandit Porsche Team John Fitzpatrick Racing | Rupert Keegan Franz Konrad | Porsche 956 | G | - |
| Porsche Type-935 2.6 L Turbo Flat-6 |
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