The following is an overview of the events of 1955 in motorsport including the major racing events, motorsport venues that were opened and closed during a year, championships and non-championship events that were established and disestablished in a year, and births and deaths of racing drivers and other motorsport people.
The calendar includes only annual major non-championship events or annual events that had own significance separate from the championship. For the dates of the championship events see related season articles.
| Date | Event | Ref | |
|---|---|---|---|
| 1–2 May | 22nd Mille Miglia | [1] | |
| 22 May | 13th Monaco Grand Prix | [2] | |
| 30 May | 39th Indianapolis 500 | [3] | |
| 4–10 June | 37th Isle of Man TT | [4] | |
| 11–12 June | 23rd 24 Hours of Le Mans | [5] | |
| 16 October | 39th Targa Florio | [6] | |
| 6 November | 2nd Macau Grand Prix | [7] |
| Date | Month | Name | Nationality | Occupation | Note | Ref | |
|---|---|---|---|---|---|---|---|
| 18 | January | Patrick Tauziac | French | Rally driver | 1990 Rallye Côte d'Ivoire winner. | [8] | |
| 24 | February | Alain Prost | French | Racing driver | Formula One World Champion (-,,). | [9] | |
| 9 | March | Franco Uncini | Italian | Motorcycle racer | 500cc Grand Prix motorcycle racing World champion . | [10] | |
| 10 | October | Mike Mangold | American | Air racer | Red Bull Air World Race champion (2005, 2007). | [11] |
| Date | Month | Name | Age | Nationality | Occupation | Note | Ref | |
|---|---|---|---|---|---|---|---|---|
| 26 | May | Alberto Ascari | 36 | Italian | Racing driver | Formula One World Champion . | [12] | |
| 30 | May | Bill Vukovich | 36 | American | Racing driver | Winner of the Indianapolis 500 (1952, 1953). Died during 1955 Indianapolis 500. | [13] | |
| 11 | June | Pierre Levegh | 49 | French | Racing driver | Died during 1955 24 Hours of Le Mans. | [14] |