Kalendar Perlumbaan TT Litar Assen 2021
| Tarikh | Siri Perlumbaan | Bulatan | Nama Acara |
|---|---|---|---|
| 18 April - 18 April | Kelas Porsche RS Selesai | Round 1 | |
| 18 April - 18 April | Piala Porsche GT Selesai | Round 1 | |
| 18 April - 18 April | Piala Boxster Porsche Selesai | Round 1 | |
| 18 April - 18 April | Piala Porsche 944 Selesai | Round 1 | |
| 6 Jun - 6 Jun | Kelas Porsche RS Selesai | Round 5 | |
| 6 Jun - 6 Jun | Piala Porsche GT Selesai | Round 5 | |
| 6 Jun - 6 Jun | Piala Boxster Porsche Selesai | Round 5 | |
| 6 Jun - 6 Jun | Piala Porsche 944 Selesai | Round 5 | |
| 25 Ogos - 25 Ogos | Piala Lumba BMW Selesai | Round 3 | |
| 12 September - 12 September | Kelas Porsche RS Selesai | Round 7 | |
| 12 September - 12 September | Piala Porsche GT Selesai | Round 7 | |
| 12 September - 12 September | Piala Boxster Porsche Selesai | Round 7 | |
| 12 September - 12 September | Piala Porsche 944 Selesai | Round 7 | |
| 17 September - 19 September | Piala Porsche Carrera Benelux Selesai | Round 5 | |
| 17 September - 19 September | Sarjana Kereta Pelancongan Jerman Selesai | Round 6 | |
| 5 Oktober - 5 Oktober | Piala Lumba BMW Selesai | Round 5 |