TT Circuit Assen 2021 Tävlingskalender
| Datum | Tävlingsserie | Runda | Evenemangsnamn |
|---|---|---|---|
| 18 april - 18 april | Porsche RS klass Klart | Round 1 | |
| 18 april - 18 april | Porsche GT Cup Klart | Round 1 | |
| 18 april - 18 april | Porsche Boxster Cup Klart | Round 1 | |
| 18 april - 18 april | Porsche 944 Cup Klart | Round 1 | |
| 6 juni - 6 juni | Porsche RS klass Klart | Round 5 | |
| 6 juni - 6 juni | Porsche GT Cup Klart | Round 5 | |
| 6 juni - 6 juni | Porsche Boxster Cup Klart | Round 5 | |
| 6 juni - 6 juni | Porsche 944 Cup Klart | Round 5 | |
| 25 augusti - 25 augusti | BMW Racing Cup Klart | Round 3 | |
| 12 september - 12 september | Porsche RS klass Klart | Round 7 | |
| 12 september - 12 september | Porsche GT Cup Klart | Round 7 | |
| 12 september - 12 september | Porsche Boxster Cup Klart | Round 7 | |
| 12 september - 12 september | Porsche 944 Cup Klart | Round 7 | |
| 17 september - 19 september | Porsche Carrera Cup Benelux Klart | Round 5 | |
| 17 september - 19 september | German Touring Car Masters Klart | Round 6 | |
| 5 oktober - 5 oktober | BMW Racing Cup Klart | Round 5 |