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Showing championship 451-500 of 2679 championships with the current search criteria.
 | Campionats de Catalunya Circuits | 4 of 4 rounds completed in 2018 |  |
 | Campionatul International de Viteza pe Circuit | No calendar for 2018 submitted | |
| Campionatul Național de Viteză pe Circuit – Istorice | 2 of 2 rounds completed in 2018 | |
 | CAMS Australian Formula 4 Championship | 6 of 6 rounds completed in 2018 | |
| CAMS S5000 Australian Championship | No calendar for 2018 submitted | |
| CAMS WA Excel Cup Championship | 10 of 10 rounds completed in 2018 | |
 | CAMSO Bangers | 7 of 7 rounds completed in 2018 | |
| CAMSO Bangerstox | 10 of 10 rounds completed in 2018 | |
| CAMSO Hot Rods | 5 of 5 rounds completed in 2018 | |
| CAMSO Lightning Rods | 5 of 5 rounds completed in 2018 | |
| CAMSO Privé Cars | 10 of 10 rounds completed in 2018 | |
| CAMSO Super Prive Cars | 7 of 7 rounds completed in 2018 | |
| CAMSO V8 | 6 of 6 rounds completed in 2018 | |
 | Can-Am Midget Racing | 13 of 13 rounds completed in 2018 | |
| Canadian Endurance Racing | 4 of 4 rounds completed in 2018 | |
| Canadian Short Track Nationals - Pro Late Model | 1 of 1 rounds completed in 2018 | |
| Canadian Short Track Nationals - Super Stock | 1 of 1 rounds completed in 2018 | |
| Canadian Super Truck Racing Series | 10 of 10 rounds completed in 2018 | |
| Canadian Touring Car Championship | 6 of 6 rounds completed in 2018 | |
| Canadian Vintage Modifieds | 11 of 11 rounds completed in 2018 | |
 | Canadian-American Challenge Cup | 3 of 3 rounds completed in 2018 | |
 | Canterbury Car Club | 5 of 5 rounds completed in 2018 | |
 | Canyon Cup | 5 of 5 rounds completed in 2018 | |
 | Cape Hell Drivers | 9 of 9 rounds completed in 2018 | |
 | Caraway Speedway - Charger | 6 of 6 rounds completed in 2018 | |
| Caraway Speedway - Late Model Stock | 2 of 2 rounds completed in 2018 | |
| Caraway Speedway - Limited Late Model | 9 of 9 rounds completed in 2018 | |
| Caraway Speedway - Mini Stock | 8 of 8 rounds completed in 2018 | |
| Caraway Speedway - Sportsman | 3 of 3 rounds completed in 2018 | |
| Caraway Speedway - U-Car | 9 of 9 rounds completed in 2018 | |
 | Carbonia Cup | 8 of 8 rounds completed in 2018 | |
| CARC Modified Coupe | 11 of 11 rounds completed in 2018 | |
 | Caribbean Motor Racing Championship | 4 of 4 rounds completed in 2018 | |
| Carolina Mini-Stock Challenge | 8 of 8 rounds completed in 2018 | |
| Carolina Vintage Racers | 9 of 9 rounds completed in 2018 | |
 | Carreras de Circuito | 5 of 5 rounds completed in 2018 | |
| Cars Late Model Stock Tour | 12 of 12 rounds completed in 2018 | |
 | Cars México | 10 of 10 rounds completed in 2018 | |
| Cars Super Late Model Tour | 9 of 9 rounds completed in 2018 | |
| Carteret County Speedway - Champ Kart | 12 of 12 rounds completed in 2018 | |
| Carteret County Speedway - Jr. Mini Cup | 7 of 7 rounds completed in 2018 | |
| Carteret County Speedway - Late Model | 10 of 10 rounds completed in 2018 | |
| Carteret County Speedway - Legends | 12 of 12 rounds completed in 2018 | |
| Carteret County Speedway - Mini Cup | 10 of 10 rounds completed in 2018 | |
| Carteret County Speedway - Mini Stock | 10 of 10 rounds completed in 2018 | |
| Carteret County Speedway - Street Stock | 9 of 9 rounds completed in 2018 | |
| Carteret County Speedway - U-CAR | 11 of 11 rounds completed in 2018 | |
| CASC GT Challenge | 5 of 5 rounds completed in 2018 | |
| CASC GT Sprint Championship | 7 of 7 rounds completed in 2018 | |
| CASC Race Ontario Formula Libre Championship | 3 of 3 rounds completed in 2018 | |