This list of 1925 motorsport champions is a list of national/international auto racing series with a Championship decided by the points or positions earned by a driver from multiple races.
| Series | Champion | Season article | |
|---|---|---|---|
| AIACR World Manufacturers' Championship |  Alfa Romeo | 1925 Grand Prix season | |
| AAA National Championship |  Peter DePaolo | 1925 AAA Championship Car season |