The 1934 Belgian Grand Prix (formally the V Grand Prix de Belgique) was a Grand Prix motor race of the 1934 Grand Prix season which was run on 29 July 1934 at the Circuit de Spa-Francorchamps, Belgium.

The Belgian-German border until the 1920s was near the bridge over Eau Rouge and near the Meiz road on the Malmedy straight. Then Belgium annexed Ostbelgien, the circuit was created, and the empty customs office was called Ancienne Douane. Before the 1934 GP race, Belgian customs asked the German teams of Auto Union and Mercedes-Benz to pay 180,000 Belgian franc duty for the alcohol based special fuel they brought. 48 hours before the start the German teams therefore withdrew their entries. Tazio Nuvolari and other Maserati 8CM were absent, too.

The race lasted 596.05 km (14.90 km x 40 laps). It was the fifth running of the Belgian Grand Prix. The Alfas were leading, but had retired before lap 30. Thus Bugatti won 1-2, the last major victory of the brand.

Classification Pos No Driver Car Laps Time/Retire 1 4 René Dreyfus Bugatti T59 40 4:15:03.8 2 6 Antonio Brivio Bugatti T59 40 +1:51.0 3 12 Raymond Sommer Maserati 8CM 40 +1 lap 4 2 Robert Benoist Bugatti T59 40 +3 laps 5 24 Charles Montier Montier Speciale-Ford 40 +10 laps Ret 16 Achille Varzi Alfa Romeo P3 Tipo-B 25 Engine Ret 14 Louis Chiron Alfa Romeo Tipo-B P3 20 Crash DNS 8 Hans Stuck Auto Union A Team withdrew DNS 10 August Momberger Auto Union A Team withdrew DNS 18 Rudolf Caracciola Mercedes-Benz W25 Team withdrew DNS 20 Luigi Fagioli Mercedes-Benz W25 Team withdrew DNS 22 Manfred von Brauchitsch Mercedes-Benz W25 Team withdrew

Fastest Lap: Antonio Brivio (Bugatti T59), 5:45.0

References