The 2005 Grand Prix of St. Petersburg was Round 3 of the 2005 Menards IRL Infiniti Pro Series. The event was held on the Streets of St. Petersburg in Florida, United States on 3 April 2005. Marco Andretti was the race winner.
Grand Prix of St. Petersburg Race Result
| Pos. | No. | Driver | Chassis | Engine | Tire | Laps | Laps Led | Status | Started | Points |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 26 | Marco Andretti | Dallara | Infiniti | Firestone | 40 | 22 | Running | 1 | 53 |
| 2 | 33 | Wade Cunningham | Dallara | Infiniti | Firestone | 40 | 18 | Running | 3 | 40 |
| 3 | 21 | Nick Bussell | Dallara | Infiniti | Firestone | 40 | 0 | Running | 4 | 35 |
| 4 | 3 | Al Unser III | Dallara | Infiniti | Firestone | 40 | 0 | Running | 7 | 32 |
| 5 | 5 | Arie Luyendyk Jr. | Dallara | Infiniti | Firestone | 40 | 0 | Running | 8 | 30 |
| 6 | 7 | Travis Gregg | Dallara | Infiniti | Firestone | 40 | 0 | Running | 9 | 28 |
| 7 | 36 | James Chesson | Dallara | Infiniti | Firestone | 40 | 0 | Running | 12 | 26 |
| 8 | 19 | Chris Festa | Dallara | Infiniti | Firestone | 39 | 0 | Running | 6 | 24 |
| 9 | 4 | Marty Roth | Dallara | Infiniti | Firestone | 39 | 0 | Running | 11 | 22 |
| DNF | 20 | Jay Drake | Dallara | Infiniti | Firestone | 27 | 0 | Gearbox | 10 | 20 |
| DNF | 6 | Jon Herb | Dallara | Infiniti | Firestone | 18 | 0 | Accident | 13 | 19 |
| DNF | 24 | Jeff Simmons | Dallara | Infiniti | Firestone | 1 | 0 | Accident | 2 | 18 |
| DNF | 1 | Jaime Camara | Dallara | Infiniti | Firestone | 0 | 0 | Accident | 5 | 17 |