The 2025 Motocross des Nations was a Motocross race held on 4 and 5 October 2025 at Ironman Raceway.
This was the first time that the track near Crawfordsville, Indiana held the event and the sixth time that the event took place in the United States.
Australia went into the event as the reigning champions, after taking their first victory at the 2024 edition. Fielding the same team from the previous edition, the Australians were able to successfully defend their title.
Start numbers were allocated based on the team finishes from the 2024 competition. This allocated number plates 1, 2 & 3 to Australia (1st), 4, 5 & 6 to United States (2nd) and 7, 8 & 9 to The Netherlands (3rd).
The provisional entry for the event was released on 8 September.
Qualifying was run on a class by class basis. Top 19 countries after qualifying went directly to the main Motocross des Nations races. The remaining countries went to a smaller final. Best 2 scores counted.
The C-Final was for the nations who finished 32nd-37th in qualifying. The top nation from the C-Final qualify for the B-Final, the remaining are eliminated. Best 2 scores for each nation counts.
The B-Final is for the nations who finished 20th-32nd in qualifying. The top nation from the B-Final qualify for the main Motocross des Nations races, the remaining are eliminated. Best 2 scores for each nation counts.
The main Motocross des Nations races consist of 3 races which combine two classes together in each. Lowest score wins with each nation allowed to drop their worst score after the final race.