The 2005 3000 Pro Series was the inaugural season of what later would become the International Formula Master racing series. The season consisted of eight rounds, beginning on 10 April at the ACI Vallelunga Circuit and finishing on 9 October at the Autodromo Nazionale Monza. 10 different teams and 26 different drivers competed. In this one-make formula all drivers had to utilize Lola B99/50 chassis and Zytek engines. It was won jointly by Austrian Norbert Siedler and Italian Massimiliano Busnelli.
| Team | Driver | Rounds | ||
|---|---|---|---|---|
 Draco Junior Team | 2 |  Timo Lienemann | All | |
| 3 | Alessandro Bonetti | All | ||
| CEK Team | 4 | Marco Mocci | 1–5, 7 | |
 Daniil Move | 8 | |||
| 5 | Sergey Zlobin | 8 | ||
| ADM Motorsport | 6 | Fausto Ippoliti | All | |
| 7 |  Norbert Siedler | All | ||
| 8 | Stefano Attianese | 1-2 | ||
| Franz Wöss | 6 | |||
| Davide Valsecchi | 8 | |||
| Scuderia Famà | 9 |  Olivier Tielemans | 1–6, 8 | |
| 10 |  Jean de Pourtales | 1-4 | ||
| Matteo Pellegrino | 5 | |||
| Nino Famà | 6 | |||
| Marco Mocci | 8 | |||
 Team JVA | 11 |  Tor Graves | All | |
| 12 | Dominik Jackson | 1, 3 | ||
| Scott Mansell | 2 | |||
| Robbie Kerr | 6 | |||
| Pro Motorsport | 14 | nowrap | Massimiliano Busnelli | All |
| 15 | Ignazio Belluardo | All | ||
| 24 |  João Barion | 8 | ||
| System Team | 16 | Sergio Ghiotto | 1-7 | |
| Carlin Motorsport | 18 |  Khalil Beschir | 2-6 | |
| 19 | Basil Shaaban | 2-6 | ||
| I Motori di Carlotta | 20 | Glauco Solieri | 2-4 | |
| Euronova Racing | 22 | Luca di Cienzo | 8 |
Points were awarded to the top eight classified finishers using the following structure:
| Position | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th |
|---|---|---|---|---|---|---|---|---|
| Points | 10 | 8 | 6 | 5 | 4 | 3 | 2 | 1 |
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NOTE - Siedler and Busnelli could not be separated by race finishing positions. Siedler had the better qualifying record but it was decided that the title would be shared.
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