TT Circuit Assen 2021 Race Calendar
| Date | Racing Series | Round | Event Name |
|---|---|---|---|
| April 18 - April 18 | Porsche RS Klasse Finished | Round 1 | |
| April 18 - April 18 | Porsche GT Cup Finished | Round 1 | |
| April 18 - April 18 | Porsche Boxster Cup Finished | Round 1 | |
| April 18 - April 18 | Porsche 944 Cup Finished | Round 1 | |
| June 6 - June 6 | Porsche RS Klasse Finished | Round 5 | |
| June 6 - June 6 | Porsche GT Cup Finished | Round 5 | |
| June 6 - June 6 | Porsche Boxster Cup Finished | Round 5 | |
| June 6 - June 6 | Porsche 944 Cup Finished | Round 5 | |
| August 25 - August 25 | BMW Racing Cup Finished | Round 3 | |
| August 27 - August 28 | Porsche Club Historic Challenge Finished | Round 5 | RSG Racing Days |
| September 12 - September 12 | Porsche RS Klasse Finished | Round 7 | |
| September 12 - September 12 | Porsche GT Cup Finished | Round 7 | |
| September 12 - September 12 | Porsche Boxster Cup Finished | Round 7 | |
| September 12 - September 12 | Porsche 944 Cup Finished | Round 7 | |
| September 17 - September 19 | Porsche Carrera Cup Benelux Finished | Round 5 | |
| September 17 - September 19 | Deutsche Tourenwagen Masters Finished | Round 6 | |
| October 5 - October 5 | BMW Racing Cup Finished | Round 5 |