The Grand Prix de Boulogne (also Grand Prix automobile de Boulogne ; German: Grand Prix Boulogne ) was a motor racing event , the 1921-1928 total of eight times near the French city of Boulogne-sur-Mer in the region Hauts-de-France was carried out.
The circuit of the Grand Prix de Boulogne was triangular in shape and about 37.4 km in length. It consisted of public roads (today N 42 , D 127 and D 341), which were closed for racing events. The start and finish were east of Boulogne-sur-Mer in La Caucherie . The corner points of the route were in Saint-Martin-Boulogne , Le Wast and Desvres .
The races each ran over twelve laps, which corresponded to a total race distance of almost 450 km.
When it was first held in 1921, separate races were held for cyclecars and voiturettes . From 1922 to 1924 the races of both categories took place within one race. From 1925 the Grand Prix de Boulogne was only advertised for voiturettes. In 1926 and 1927 the Grand Prix was held in the Formula Libre , Voiturettes and Cyclecars classes. In 1927 the Grand Prix de Boulogne was also the Grand Prix of the UMF
Due to its proximity to the British Isles , the Grand Prix de Boulogne attracted numerous drivers from the United Kingdom and saw British winners a total of six times.