Debutants
Marco Brenner is the youngest debutant in Kuurne-Brussel-Kuurne in 2021. There are 45 debutants.
| # | Rider | Team | Age |
|---|---|---|---|
| 1 | BRENNER Marco | Team DSM | 18y + 185d |
| 2 | PAJUR Markus | Team Arkéa Samsic | 20y + 158d |
| 3 | VAN DEN BOSSCHE Fabio | Sport Vlaanderen - Baloise | 20y + 160d |
| 4 | WÆRENSKJOLD Søren | Uno-X Pro Cycling Team | 20y + 353d |
| 5 | REX Laurenz | Bingoal - Wallonie Bruxelles | 21y + 75d |
| 6 | DE WILDE Gilles | Sport Vlaanderen - Baloise | 21y + 139d |
| 7 | PAQUOT Tom | Bingoal - Wallonie Bruxelles | 21y + 159d |
| 8 | PIDCOCK Thomas | INEOS Grenadiers | 21y + 213d |
| 9 | LEKNESSUND Andreas | Team DSM | 21y + 283d |
| 10 | VANHOOF Ward | Sport Vlaanderen - Baloise | 21y + 316d |
| 11 | VERMEERSCH Florian | Lotto Soudal | 21y + 353d |
| 12 | MARIT Arne | Sport Vlaanderen - Baloise | 22y + 38d |
| 13 | SUTER Joel | Bingoal - Wallonie Bruxelles | 22y + 126d |
| 14 | HAYTER Ethan | INEOS Grenadiers | 22y + 163d |
| 15 | SCHNEITER Joab | Vini Zabù | 22y + 206d |
| 16 | MEEUS Jordi | BORA - hansgrohe | 22y + 242d |
| 17 | THIJSSEN Gerben | Lotto Soudal | 22y + 252d |
| 18 | KRON Andreas | Lotto Soudal | 22y + 272d |
| 19 | REYNDERS Jens | Sport Vlaanderen - Baloise | 22y + 279d |
| 20 | EGHOLM Jakob | Trek - Segafredo | 22y + 307d |
| 21 | JULLIEN Anthony | AG2R Citroën Team | 22y + 360d |
| 22 | OLDANI Stefano | Lotto Soudal | 23y + 49d |
| 23 | CARVALHO Andre | Cofidis | 23y + 120d |
| 24 | KANTER Max | Team DSM | 23y + 129d |
| 25 | SAJNOK Szymon | Cofidis | 23y + 188d |
| 26 | NARVÁEZ Jhonatan | INEOS Grenadiers | 23y + 361d |
| 27 | BEVILACQUA Simone | Vini Zabù | 24y + 6d |
| 28 | ANIOŁKOWSKI Stanisław | Bingoal - Wallonie Bruxelles | 24y + 39d |
| 29 | HODEG Álvaro José | Deceuninck - Quick Step | 24y + 165d |
| 30 | SCOTSON Callum | Team BikeExchange | 24y + 202d |
| 31 | PADUN Mark | Bahrain - Victorious | 24y + 237d |
| 32 | WILLIAMS Stephen | Bahrain - Victorious | 24y + 264d |
| 33 | TAMINIAUX Lionel | Alpecin - Fenix | 24y + 283d |
| 34 | STEIMLE Jannik | Deceuninck - Quick Step | 24y + 330d |
| 35 | SWIFT Connor | Team Arkéa Samsic | 25y + 121d |
| 36 | DE VYLDER Lindsay | Sport Vlaanderen - Baloise | 25y + 274d |
| 37 | PLANCKAERT Edward | Alpecin - Fenix | 26y + 27d |
| 38 | VAN DER POEL Mathieu | Alpecin - Fenix | 26y + 40d |
| 39 | MARTINELLI Davide | Astana - Premier Tech | 27y + 273d |
| 40 | RIESEBEEK Oscar | Alpecin - Fenix | 28y + 67d |
| 41 | CAMPENAERTS Victor | Team Qhubeka ASSOS | 29y + 123d |
| 42 | ZAKHAROV Artyom | Astana - Premier Tech | 29y + 124d |
| 43 | WELLENS Tim | Lotto Soudal | 29y + 294d |
| 44 | ORRICO Davide | Vini Zabù | 31y + 11d |
| 45 | IZAGIRRE Gorka | Astana - Premier Tech | 33y + 144d |