| Race details | |||||||||||||||||||||||||||
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| Race 15 of 17 races in the 2005 Grand Prix motorcycle racing season | |||||||||||||||||||||||||||
| Date | 14–16 October 2005 | ||||||||||||||||||||||||||
| Official name | Polini Australian Grand Prix[1][2][3] | ||||||||||||||||||||||||||
| Location | Phillip Island Grand Prix Circuit | ||||||||||||||||||||||||||
| Course |
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| MotoGP | |||||||||||||||||||||||||||
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| 250cc | |||||||||||||||||||||||||||
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| 125cc | |||||||||||||||||||||||||||
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The2005 Australian motorcycle Grand Prix was the fifteenth round of the2005 MotoGP Championship. It took place on the weekend of 13–15 October 2005 at thePhillip Island Grand Prix Circuit. It was also the final victory forValentino Rossi at Phillip Island until the2014 event.

| Pos. | No. | Rider | Team | Manufacturer | Laps | Time/Retired | Grid | Points |
|---|---|---|---|---|---|---|---|---|
| 1 | 46 | Gauloises Yamaha Team | Yamaha | 27 | 41:08.542 | 2 | 25 | |
| 2 | 69 | Repsol Honda Team | Honda | 27 | +1.007 | 1 | 20 | |
| 3 | 7 | Ducati Marlboro Team | Ducati | 27 | +4.215 | 4 | 16 | |
| 4 | 33 | Movistar Honda MotoGP | Honda | 27 | +4.232 | 8 | 13 | |
| 5 | 15 | Movistar Honda MotoGP | Honda | 27 | +14.088 | 3 | 11 | |
| 6 | 5 | Gauloises Yamaha Team | Yamaha | 27 | +33.200 | 5 | 10 | |
| 7 | 56 | Kawasaki Racing Team | Kawasaki | 27 | +45.055 | 10 | 9 | |
| 8 | 6 | Konica Minolta Honda | Honda | 27 | +45.103 | 9 | 8 | |
| 9 | 24 | Fortuna Yamaha Team | Yamaha | 27 | +45.104 | 7 | 7 | |
| 10 | 21 | Team Suzuki MotoGP | Suzuki | 27 | +50.260 | 11 | 6 | |
| 11 | 17 | Camel Honda | Honda | 27 | +50.697 | 14 | 5 | |
| 12 | 11 | Fortuna Yamaha Team | Yamaha | 27 | +1:08.324 | 15 | 4 | |
| 13 | 44 | Team d'Antin Pramac | Ducati | 27 | +1:31.737 | 16 | 3 | |
| 14 | 77 | Blata WCM | Blata | 26 | +1 lap | 17 | 2 | |
| 15 | 27 | Blata WCM | Blata | 26 | +1 lap | 18 | 1 | |
| 16 | 19 | Kawasaki Racing Team | Kawasaki | 25 | +2 laps | 13 | ||
| Ret | 4 | Camel Honda | Honda | 22 | Accident | 12 | ||
| Ret | 3 | Repsol Honda Team | Honda | 0 | Accident | 6 | ||
| WD | 10 | Team Suzuki MotoGP | Suzuki | Withdrew | ||||
| WD | 65 | Ducati Marlboro Team | Ducati | Withdrew | ||||
| Sources:[4][5][6] | ||||||||

Below are the standings for the top five riders and constructors after round fifteen has concluded.[9]
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| Previous race: 2005 Qatar Grand Prix | FIMGrand Prix World Championship 2005 season | Next race: 2005 Turkish Grand Prix |
| Previous race: 2004 Australian Grand Prix | Australian motorcycle Grand Prix | Next race: 2006 Australian Grand Prix |