| 1964 FIM Motocross World Championship | |
|---|---|
| Organizer | FIM |
| Duration | 5 April/13 September |
| Number of races | 28 |
| Number of manufacturers | 13 |
| Champions | |
| 500cc |  Jeff Smith |
| 250cc |  Joël Robert |
The 1964 Motocross World Championship was the 8th edition of the Motocross World Championship organized by the FIM and reserved for 500cc and 250cc motorcycles.