The2005 GP2 Series season was the thirty-ninth season of the second-tier ofFormula One feeder championship and also first season under theGP2 Series moniker. The season started inImola,Italy on 23 April, and ended inSakhir,Bahrain on 30 September. The season was won by theGermanNico Rosberg, with theFinnHeikki Kovalainen finishing second.

2005 was the first season of the newly renamed Formula One feeder series, fromFormula 3000 to GP2. The inaugural season did not feature reigning F3000 championVitantonio Liuzzi, because theItalian was driving forRed Bull Racing inFormula One. The series did feature two former F1 drivers,ItaliansGianmaria Bruni andGiorgio Pantano, driving forColoni andSuperNova respectively.

In the opening race at Imola, there were a number of mechanical problems and with organisers afraid of trouble at the start, the rolling start was used in both races despite the weather being dry.Nicolas Lapierre had taken his inaugural pole position but he was out before the race had started due to mechanical problems. The race was won by his team-mate Heikki Kovalainen.

After the first weekend, it was decided that the points for the fastest lap would only be awarded if the driver was classified. This was due to the event in the Imola sprint race, where Lapierre started with a fuel load with which he wouldn't have been able to finish, set a fastest lap and retired soon after.

At Montmeló, the drivers could finally experience standing starts. F1 refugee Bruni won the feature race andJosé María López the sprint race. The first four races had been won by four drivers in four teams, highlighting that the field had many competitive drivers.Adam Carroll was the first driver to take a second victory after he won at Monaco, where only one race was held.

At Nürburgring, the sprint race was extended from 80 to 120 kilometres. This coincided with F1 dropping its second qualifying session on Sunday morning. The sprint race turned to be one of the most exciting of the season, with MonegasqueClivio Piccione winning.

Heikki Kovalainen was the top driver early in the season, winning three of the first five feature races. However, the season took a turnaround at Magny-Cours, where ART Grand Prix started going strong. Tactical errors caused them to lose the feature race, but Nico Rosberg gave them their first win at the sprint. Rosberg went on to win the next two feature races, while Olivier Pla won both sprints having started from pole position in both of them.

At the qualifying of the Hungaroring race, ART cars were disqualified for illegal position of their steering rack. They were sent to back of the grid but it didn't stop them taking points finishes in the feature and 1-2 in the sprint race, whereAlexandre Prémat won his first race.Neel Jani joined the winners' list in the feature race.

Prémat also won the next race at Istanbul, while championship leading duo Kovalainen and Rosberg finished outside the points. The sprint race started in wet conditions but dried out, so tyre changes were necessary. Kovalainen did that move perfectly and won the race having started 10th. Rosberg jumped from 17th to 3rd.

Kovalainen and Jani won races at Monza but Rosberg took the most points with two second places and two fastest laps.Nelson Piquet Jr. then won the feature race at Spa-Francorchamps while Rosberg took the championship lead from Kovalainen who spun off on the last lap while battling for eighth place and pole for Sunday's race. Carroll led the sprint race from the start but following accidents involvingErnesto Viso,Hiroki Yoshimoto and Jani the race was stopped early and only half points were awarded. Viso still ended in 3rd position thanks to countback rule.

The championship was decided in Bahrain which held the only race not supporting F1. Rosberg led Kovalainen by three points and increased his lead by taking pole position. Rosberg also won the race and clinched the title as Kovalainen was 3rd. Rosberg then also won the sprint race, becoming the first driver in the series to win both races during an event.

All of the teams used theDallaraGP2/05 chassis withRenault-badged 4.0 litre (244 cu in) naturally-aspiratedMecachromeV8 engines in 2005 in order to keep the field fair.

As this was the inaugural season in the series, car numbers were distributed by a pre-season session held atCircuit Paul Ricard on 6 April. The fastest driver got number 1, his team-mate number 2, next best driver number 3 etc.^[1]

Entering GP2

• Juan Cruz Álvarez:World Series by Nissan (Gabord Competición) →Campos Racing
• Can Artam:International Formula 3000 (Coloni Motorsport &Super Nova Racing) →iSport International
• Gianmaria Bruni:Formula One (Minardi Cosworth) → Coloni Motorsport
• Adam Carroll:British Formula 3 Championship (P1 Racing) →Super Nova International
• Fairuz Fauzy: British Formula 3 Championship (Menu F3 Motorsport & P1 Racing) →DAMS
• Borja García:Spanish Formula Three Championship (Racing Engineering) → Racing Engineering
• Sergio Hernández: Spanish Formula Three Championship (Adrian Campos Motorsport) & World Series by Nissan (Saulnier Racing) → Campos Racing
• Neel Jani:Formula Renault V6 Eurocup (DAMS) → Racing Engineering
• Heikki Kovalainen: World Series by Nissan (Pons Racing) →Arden International
• Mathias Lauda: International Formula 3000 (CMS Performance) &Superfund Euro Formula 3000 (Traini Corse) → Coloni Motorsport
• Nicolas Lapierre:Formula Three Euroseries (Signature) → Arden International
• José María López: International Formula 3000 (CMS Performance) & Formula Renault V6 Eurocup (DAMS) → DAMS
• Ferdinando Monfardini: International Formula 3000 (Spero I.E.) →Durango
• Alexandre Sarnes Negrão:Formula Three Sudamericana (Piquet Sports) →Hitech Piquet Sports
• Giorgio Pantano: Formula One (Jordan Ford) → Super Nova International
• Clivio Piccione: British Formula 3 Championship (Carlin Motorsport) → Durango
• Nelson Piquet Jr.: British Formula 3 Championship (Piquet Sports) → Hitech Piquet Sports
• Olivier Pla: World Series by Nissan (RC Motorsport & Carlin Motorsport) →DPR
• Alexandre Prémat: Formula Three Euroseries (ASM Formule 3) →ART Grand Prix
• Nico Rosberg: Formula Three Euroseries (Team Rosberg) → ART Grand Prix
• Ryan Sharp: Formula Renault V6 Eurocup (Jenzer Motorsport) → DPR
• Scott Speed:Eurocup Formula Renault 2.0 &Formula Renault 2.0 Germany (Motopark Academy) →iSport International
• Toni Vilander:Italian Formula Three Championship (Coloni F3) &Formula Three Euroseries (Coloni F3) → Coloni Motorsport
• Ernesto Viso: [British Formula 3 Championship (P1 Racing) & International Formula 3000 (Durango) →BCN Competición
• Hiroki Yoshimoto: World Series by Nissan (Gabord Competición) → BCN Competición

• Giorgio Mondini replacedRyan Sharp forHungarian races
• Toni Vilander replacedGianmaria Bruni forItalian races.
• Gianmaria Bruni replacedFerdinando Monfardini forBelgian races.
• Ferdinando Monfardini replacedToni Vilander forBahrain races.

There were 23 races in the 2005 GP2 Series championship at 12 different circuits. Eleven race weekends had one race on Saturday and another on Sunday, the exception being the race atCircuit de Monaco where there was only one race on the weekend. The season began on 23 April 2005 and concluded on 25 September 2005.

The calendar was as follows:

Scoring system

Points are awarded to the top 8 classified finishers in the Feature race, and to the top 6 classified finishers in the Sprint race. The pole-sitter in the feature race will also receive two points, and two points are given to the driver who set the fastest lap in the feature and sprint races. The driver also has to drive 90% of race laps. No extra points are awarded to the pole-sitter in the sprint race.

Feature race points

Sprint race points

Points are awarded to the top 6 classified finishers.

Notes:

• † – Drivers did not finish the race, but were classified as they completed more than 90% of the race distance.
• ‡ – Sprint race atSpa was stopped early and half points were awarded.

• GP2 Series & GP2 Asia Series
• Results at autosport.com
• Results at sportresultaten.be