MAY 2021
| 8-9 May |
OFFROAD TROPHY Round 1  Rayong |
 NC |
Organised By MAKLAY GROUP |
| 8-9 May |
TOYO RACINGCAR THAILAND Round 2 Bira Circuit |
SC |
Organised By FAEAST |
| 9 May |
ROK CUP THAILAND Round 2 Bira Kart |
SC |
Organised By CTG 2002 |
| 14-16 May |
Thailand Super Series Round 2 BBRIC |
Inter |
Organised By Racing Spirit |
| 15 May |
Gran Turismo Pro Series Thailand Championship Season 1 Race 3 GPI Studio |
NC |
Organised By GPI |
| 21-23 May |
TOYOTA Gazoo Racing Motorsport Round 1 Phuket |
SC |
Organised By TRD |
| 22-23 May |
EXPLORER TWC THAILAND CROSS COUNTRY RALLY CHAMPIONSHIP Round 2 Nakhon Ratchasima |
NC |
Organised By TWC Engineering and System |
| 29 May |
Gran Turismo Pro Series Thailand Championship Season 1 Race 4 GPI Studio |
NC |
Organised By GPI |
| 29-30 May |
RAAT THAILAND ENDURANCE CHAMPIONSHIP INTERNATIONAL Round 1 BRIC |
Zone |
Organised By RAAT |
| 29-30 May | F2 Thailand Rally Championship Round 2 Chai Nat |
NC |
Organised By Bodyshop Sports X |
| 29-30 May |
Rotax Max Challenge Thailand Round 2 Bira Kart |
SC |
Organised By Moment Media |
