The 1925 Grand Prix season was the first AIACR World Manufacturers' Championship season. The championship was won by Alfa Romeo, utilising the P2 model.
World Championship Grands Prix
The Indianapolis 500 counted towards the AAA Championship Car title.
Other Grands Prix
Championship Final Standings
Note: To be eligible for the championship, manufacturers had to take part in both the Grand Prix of their country of origin and the Italian Grand Prix.
||Did not participate
* Only one dropped score allowed