This list of 1966 motorsport champions is a list of national or international auto racing series with a Championship decided by the points or positions earned by a driver from multiple races.
| Series | Manufacturer | Season | |
|---|---|---|---|
| International Manufacturers Championship | Class P+2.0:  FordClass P2.0: Porsche | 1966 World Sportscar Championship season | |
| International Sports Car Championship | Class S+2.0: Ford Class S2.0: Porsche Class S1.3:  Abarth | 1966 World Sportscar Championship season | |
| Canadian American Challenge Cup |  John Surtees | 1966 Can-Am season | |
| United States Road Racing Championship | Chuck Parsons | 1966 United States Road Racing Championship season |
