The following teams and drivers competed in the 1955 FIA World Championship.

Mercedes drivers again dominated the championship, with Fangio taking four races and his new teammate Stirling Moss winning the British Grand Prix. Ferrari won at Monaco after all of the Mercedes cars broke down and Lancia driver Alberto Ascari crashed into the harbour. Although Ascari was apparently unscathed, the double World Champion crashed fatally at Monza while testing sportscars four days later.

The disaster at the 24 Hours of Le Mans on 11 June, which killed Pierre Levegh and over 80 spectators, led to the cancellations of the French, German, Spanish, and Swiss Grands Prix.^[2] The French round, which was supposed to be held at Reims between the Dutch and British rounds, on 3 July, was first rescheduled to 25 September^[3] and subsequently cancelled. Then the German event, scheduled for 31 July at the Nürburgring, the Swiss round at Bremgarten, planned to take place on 21 August, and the Spanish round on 23 October at Pedralbes, followed suit.^[4] Pedralbes and Bremgarten were then abandoned and never used again for racing; motor racing was banned altogether in Switzerland, and no circuit race was held in Switzerland until the 2018 Zürich ePrix. These cancellations effectively handed the Drivers' title to Fangio after he finished 2nd to Moss at the British Grand Prix. However, he was not crowned champion until well after the British Grand Prix because the German, Swiss and Spanish rounds were cancelled after the British Grand Prix took place.

The 1955 season would be the final for Mercedes Benz as a constructor until the team's revival in 2010. It would also mark the final win for Mercedes until the 2012 Chinese Grand Prix.

Aside from Ascari's death this year, Italian Mario Alborghetti died at the non-championship Pau Grand Prix in France driving a Maserati and two drivers were killed in the Indy 500, Manny Ayulo in practice, and previous race winner Bill Vukovich during the race two weeks later.

The following rounds were included on the provisional calendars published but were cancelled:

Calendar changes edit

The Monaco Grand Prix returned to the calendar after a five year absence.

The Dutch Grand Prix returned to the calendar after a year absence.

The British Grand Prix was moved from Silverstone Circuit to Aintree Motor Racing Circuit, in keeping with the event-sharing arrangement between the two circuits.

The French Grand Prix was supposed to have been held on 3 July but was cancelled.

The German Grand Prix was supposed to have been held on 31 July but was cancelled.

The Swiss Grand Prix was supposed to have been held on 21 August but was cancelled.

The Spanish Grand Prix was supposed to have been held on 23 October but was cancelled.

Grands Prix edit

World Championship of Drivers standings edit

Championship points were awarded on an 8–6–4–3–2 basis for the first five places at each race. One point was awarded for the fastest race lap at each race. Only the best five results counted towards the championship. Numbers without parentheses are Championship points; numbers in parentheses are total points scored.

• Italics indicates the fastest lap (1 point awarded – point shared equally between drivers sharing fastest lap)
• Bold indicates pole position
• † = Car driven by more than one driver

Other Formula One races were also held in 1955, which did not count towards the World Championship.