Juan Pablo Montoya won the Italian Grand Prix 2005 at Autodromo Nazionale di Monza on 4 September 2005, starting from pole position. Fernando Alonso finished second for Renault, with Giancarlo Fisichella completing the podium for Renault. Kimi Räikkönen set the fastest lap with a time of 1:21.504.
| Pos | Grid | Driver | Team | Laps | Time / Status | Pts | FL |
|---|---|---|---|---|---|---|---|
| 1 | 1 | Juan Pablo MontoyaMON | McLaren | 53 | 1:14:28.659 | 10 | |
| 2 | 2 | Fernando AlonsoALO | Renault | 53 | +2.479 | 8 | |
| 3 | 8 | Giancarlo FisichellaFIS | Renault | 53 | +17.975 | 6 | |
| 4 | 11 | Kimi RäikkönenRAI | McLaren | 53 | +22.775 | 5 | ⚡ 1:21.504 |
| 5 | 5 | Jarno TrulliTRU | Toyota | 53 | +33.786 | 4 | |
| 6 | 9 | Ralf SchumacherSCH | Toyota | 53 | +43.925 | 3 | |
| 7 | 16 | Antônio PizzoniaPIZ | Williams | 53 | +44.643 | 2 | |
| 8 | 3 | Jenson ButtonBUT | BAR | 53 | +1:03.635 | 1 | |
| 9 | 15 | Felipe MassaMAS | Sauber | 53 | +1:15.413 | 0 | |
| 10 | 6 | Michael SchumacherMSC | Ferrari | 53 | +1:36.070 | 0 | |
| 11 | 12 | Jacques VilleneuveVIL | Sauber | 52 | +1 Lap | 0 | |
| 12 | 7 | Rubens BarrichelloBAR | Ferrari | 52 | +1 Lap | 0 | |
| 13 | 13 | Christian KlienKLI | Red Bull | 52 | +1 Lap | 0 | |
| 14 | 14 | Mark WebberWEB | Williams | 52 | +1 Lap | 0 | |
| 15 | 10 | David CoulthardCOU | Red Bull | 52 | +1 Lap | 0 | |
| 16 | 4 | Takuma SatoSAT | BAR | 52 | +1 Lap | 0 | |
| 17 | 17 | Tiago MonteiroTMO | Jordan | 51 | +2 Laps | 0 | |
| 18 | 18 | Robert DoornbosDOO | Minardi | 51 | +2 Laps | 0 | |
| 19 | 20 | Christijan AlbersALB | Minardi | 51 | +2 Laps | 0 | |
| 20 | 19 | Narain KarthikeyanKAR | Jordan | 50 | +3 Laps | 0 |
| Pos | Driver | Team | Q1 | Q2 | Q3 |
|---|---|---|---|---|---|
| 1 | Kimi Räikkönen | McLaren | 1:20.878 | - | - |
| 2 | Juan Pablo Montoya | McLaren | 1:21.054 | - | - |
| 3 | Fernando Alonso | Renault | 1:21.319 | - | - |
| 4 | Jenson Button | BAR | 1:21.369 | - | - |
| 5 | Takuma Sato | BAR | 1:21.477 | - | - |
| 6 | Jarno Trulli | Toyota | 1:21.640 | - | - |
| 7 | Michael Schumacher | Ferrari | 1:21.721 | - | - |
| 8 | Rubens Barrichello | Ferrari | 1:21.962 | - | - |
| 9 | Giancarlo Fisichella | Renault | 1:22.068 | - | - |
| 10 | Ralf Schumacher | Toyota | 1:22.266 | - | - |
| 11 | David Coulthard | Red Bull | 1:22.304 | - | - |
| 12 | Jacques Villeneuve | Sauber | 1:22.356 | - | - |
| 13 | Christian Klien | Red Bull | 1:22.532 | - | - |
| 14 | Mark Webber | Williams | 1:22.560 | - | - |
| 15 | Felipe Massa | Sauber | 1:23.060 | - | - |
| 16 | Antônio Pizzonia | Williams | 1:23.291 | - | - |
| 17 | Tiago Monteiro | Jordan | 1:24.666 | - | - |
| 18 | Robert Doornbos | Minardi | 1:24.904 | - | - |
| 19 | Narain Karthikeyan | Jordan | 1:25.859 | - | - |
| 20 | Christijan Albers | Minardi | 1:26.964 | - | - |