| 1965 FIM Motocross World Championship | |
|---|---|
| Organizer | FIM |
| Duration | 28 March/3 October |
| Number of races | 28 |
| Number of manufacturers | 12 |
| Champions | |
| 500cc |  Jeff Smith |
| 250cc |  Victor Arbekov |
The 1965 Motocross World Championship was the 9th edition of the Motocross World Championship organized by the FIM and reserved for 500cc and 250cc motorcycles.