2005 Australian motorcycle Grand Prix
The 2005 Australian motorcycle Grand Prix was the fifteenth round of the 2005 MotoGP Championship. It took place on the weekend of 13-15 October 2005 at the Phillip Island Grand Prix Circuit. It was also the final victory for Valentino Rossi at Phillip Island until the 2014 event.
250 cc classification
125 cc classification
Championship standings after the race (motoGP)
Below are the standings for the top five riders and constructors after round fifteen has concluded.
;Riders' Championship standings
;Constructors' Championship standings
| Constructor | Points |
| 1 |  Yamaha | 345 |
| 2 | Honda | 291 |
| 3 |  Ducati | 178 |
| 4 | Kawasaki | 115 |
| 5 | Suzuki | 96 |
- Note: Only the top five positions are included for both sets of standings.
Nicky Hayden