Kalendaryo ng Karera TT Circuit Assen 2021
| Petsa | Serye ng Karera | Biluhaba | Pangalan ng Kaganapan |
|---|---|---|---|
| 18 April - 18 April | Porsche RS Class Natapos | Round 1 | |
| 18 April - 18 April | Porsche GT Cup Natapos | Round 1 | |
| 18 April - 18 April | Porsche Boxster Cup Natapos | Round 1 | |
| 18 April - 18 April | Porsche 944 Cup Natapos | Round 1 | |
| 6 June - 6 June | Porsche RS Class Natapos | Round 5 | |
| 6 June - 6 June | Porsche GT Cup Natapos | Round 5 | |
| 6 June - 6 June | Porsche Boxster Cup Natapos | Round 5 | |
| 6 June - 6 June | Porsche 944 Cup Natapos | Round 5 | |
| 25 August - 25 August | BMW Racing Cup Natapos | Round 3 | |
| 12 September - 12 September | Porsche RS Class Natapos | Round 7 | |
| 12 September - 12 September | Porsche GT Cup Natapos | Round 7 | |
| 12 September - 12 September | Porsche Boxster Cup Natapos | Round 7 | |
| 12 September - 12 September | Porsche 944 Cup Natapos | Round 7 | |
| 17 September - 19 September | Porsche Carrera Cup Benelux Natapos | Round 5 | |
| 17 September - 19 September | German Touring Car Masters Natapos | Round 6 | |
| 5 October - 5 October | BMW Racing Cup Natapos | Round 5 |