1934 Grand Prix season
The 1934 Grand Prix season was the final year of a two-year hiatus for the European Championship. Achille Varzi proved to be the most successful driver, winning six Grands Prix. Alfa Romeo's cars proved difficult to beat, winning 18 of the season's 35 Grands Prix.
Season review
Grandes Épreuves
| Date | Name | Circuit | Winning drivers | Winning constructor | Report |
| 2 April |  Monaco Grand Prix | Monaco |  Guy Moll | Alfa Romeo | Report |
| 1 July | French Grand Prix | Montlhéry | Louis Chiron | Alfa Romeo | Report |
| 15 July |  German Grand Prix | Nürburgring | Hans Stuck | Auto Union | Report |
| 29 July |  Belgian Grand Prix | Spa-Francorchamps | René Dreyfus | Bugatti | Report |
| 9 September |  Italian Grand Prix | Monza | Rudolf Caracciola | Mercedes-Benz | Report |
| 9 September | Italian Grand Prix | Monza |  Luigi Fagioli | Mercedes-Benz | Report |
| 23 September |  Spanish Grand Prix | Lasarte | Luigi Fagioli | Mercedes-Benz | Report |
Other Grands Prix
| Date | Name | Circuit | Winning driver | Winning constructor | Report |
| 18 February |  Vallentunaloppet | Vallentunasjön | Paul Pietsch | Alfa Romeo | Report |
| 25 February |  Norwegian Grand Prix | Mjøsa, Lillehammer | Per-Viktor Widengren | Alfa Romeo | Report |
| 22 April | Alessandria Circuit | Alessandria | Achille Varzi | Alfa Romeo | Report |
| 6 May | Tripoli Grand Prix | Mellaha | Achille Varzi | Alfa Romeo | Report |
| 13 May |  Finnish Grand Prix | Eläintarharata | Eugen Bjørnstad | Alfa Romeo | Report |
| 20 May | Casablanca Grand Prix | Anfa Circuit | Louis Chiron | Alfa Romeo | Report |
| 20 May | Targa Florio | Madonie | Achille Varzi | Alfa Romeo | Report |
| 20 May | Grand Prix des Frontières | Chimay | Willy Longueville | Bugatti | Report |
| 27 May | Avusrennen | AVUS | Guy Moll | Alfa Romeo | Report |
| 27 May | Picardy Grand Prix | Péronne | Benoît Falchetto | Maserati | Report |
| 2 June |  Mannin Moar | Douglas | Brian Lewis | Alfa Romeo | Report |
| 3 June | Eifelrennen | Nürburgring | Manfred von Brauchitsch | Mercedes-Benz | Report |
| 3 June |  Montreux Grand Prix | Montreux | Carlo Felice Trossi | Alfa Romeo | Report |
| 17 June | Penya Rhin Grand Prix | Montjuïc Park | Achille Varzi | Alfa Romeo | Report |
| 8 July | Grand Prix de la Marne | Reims-Gueux | Louis Chiron | Alfa Romeo | Report |
| 15 July | Vichy Grand Prix | Vichy | Carlo Felice Trossi | Alfa Romeo | Report |
| 22 July | Coppa Ciano | Montenero | Achille Varzi | Alfa Romeo | Report |
| 22 July | Albi Grand Prix | Albi | Rupert Featherstonhaugh | Maserati | Report |
| 22 July | Dieppe Grand Prix | Dieppe | Philippe Étancelin | Maserati | Report |
| 15 August | Coppa Acerbo | Pescara | Luigi Fagioli | Mercedes-Benz | Report |
| 19 August | Nice Grand Prix | Nice | Achille Varzi | Alfa Romeo | Report |
| 26 August | Grand Prix du Comminges | Saint-Gaudens | Gianfranco Comotti | Alfa Romeo | Report |
| 26 August | Swiss Grand Prix | Bremgarten | Hans Stuck | Auto Union | Report |
| 2 September | Biella Circuit | Biella | Carlo Felice Trossi | Alfa Romeo | Report |
| 9 September | U.M.F. Grand Prix | Montlhéry | Benoît Falchetto | Alfa Romeo | Report |
| 30 September |  Czechoslovakian Grand Prix | Masaryk Circuit | Hans Stuck | Auto Union | Report |
| 3 October |  Rio de Janeiro Grand Prix | Gávea | Irineu Corrêa | Ford | Report |
| 6 October | Donington Park Trophy | Donington Park |  Whitney Straight | Maserati | Report |
| 13 October | Mountain Championship | Brooklands | Whitney Straight | Maserati | Report |
| 14 October | Modena Grand Prix | Modena | Tazio Nuvolari | Maserati | Report |
| 21 October | Naples Grand Prix | Posillipo | Tazio Nuvolari | Maserati | Report |
| 28 October | Algerian Grand Prix | Algiers | Jean-Pierre Wimille | Bugatti | Report |