Updated 10pm, 3 September.
Provisional startlist for the 2021 Tour of Britain, 5-12 September. Route details here.
| # | Rider | Team | Nat |
| 1 | Xandro Meurisse | Alpecin – Fenix | BEL |
| 2 | Silvan Dilllier | Alpecin – Fenix | SUI |
| 3 | Jimmy Janssens | Alpecin – Fenix | BEL |
| 4 | Ben Tulett | Alpecin – Fenix | GBR |
| 5 | Alexandar Richardson | Alpecin – Fenix | GBR |
| 6 | Kristian Sbaragli | Alpecin – Fenix | ITA |
| 11 | Mark Cavendish | Deceuninck – Quick-Step | GBR |
| 12 | Julian Alaphilippe | Deceuninck – Quick-Step | FRA |
| 13 | Davide Ballerini | Deceuninck – Quick-Step | ITA |
| 14 | Tim Declercq | Deceuninck – Quick-Step | BEL |
| 15 | Mikkel Honoré | Deceuninck – Quick-Step | DEN |
| 16 | Yves Lampaert | Deceuninck – Quick-Step | BEL |
| 21 | Ethan Hayter | INEOS Grenadiers | GBR |
| 22 | Rohan Dennis | INEOS Grenadiers | AUS |
| 23 | Owain Doull | INEOS Grenadiers | GBR |
| 24 | Michal Kwiatowski | INEOS Grenadiers | POL |
| 25 | Carlos Rodriguez | INEOS Grenadiers | ESP |
| 26 | Richie Porte | INEOS Grenadiers | AUS |
| 31 | Wout Van Aert | Team Jumbo – Visma | BEL |
| 32 | George Bennett | Team Jumbo – Visma | NZL |
| 33 | Chris Harper | Team Jumbo – Visma | AUS |
| 34 | Pascal Eenkhoorn | Team Jumbo – Visma | NED |
| 35 | Tobias Foss | Team Jumbo – Visma | NOR |
| 36 | Tony Martin | Team Jumbo – Visma | GER |
| 41 | Jokin Murguialday | Caja Rural – Seguros RGA | ESP |
| 42 | Jon Barrenetxea | Caja Rural – Seguros RGA | ESP |
| 43 | Josu Etxeberria | Caja Rural – Seguros RGA | ESP |
| 44 | David González | Caja Rural – Seguros RGA | ESP |
| 45 | Sergio Roman Martín | Caja Rural – Seguros RGA | ESP |
| 46 | Joel Nicolau | Caja Rural – Seguros RGA | ESP |
| 51 | Rhys Britton | Great Britain | GBR |
| 52 | Alfie George | Great Britain | GBR |
| 53 | Max Rushby | Great Britain | GBR |
| 54 | William Tidball | Great Britain | GBR |
| 55 | Ethan Vernon | Great Britain | GBR |
| 56 | Oliver Stockwell | Great Britain | GBR |
| 61 | Tim Edvard Pettersen | Global 6 Cycling | MON |
| 62 | Hans Becking | Global 6 Cycling | NED |
| 63 | Dan Erik Hansen | Global 6 Cycling | NOR |
| 64 | James Mitri | Global 6 Cycling | NZL |
| 65 | Michal Paluta | Global 6 Cycling | POL |
| 66 | Nicolas Sessler | Global 6 Cycling | BRA |
| 71 | Joey Rosskopf | Rally Cycling | USA |
| 72 | Robin Carpenter | Rally Cycling | USA |
| 73 | Colin Joyce | Rally Cycling | USA |
| 74 | Gavin Mannion | Rally Cycling | USA |
| 75 | Kyle Murphy | Rally Cycling | USA |
| 76 | Nickolas Zukowsky | Rally Cycling | CAN |
| 81 | Rory Townsend | Canyon dhb SunGod | IRL |
| 82 | Matt Bostock | Canyon dhb SunGod | GBR |
| 83 | Ryan Christensen | Canyon dhb SunGod | NZL |
| 84 | Thomas Mein | Canyon dhb SunGod | GBR |
| 85 | Jacob Scott | Canyon dhb SunGod | GBR |
| 86 | Max Stedman | Canyon dhb SunGod | GBR |
| 91 | Dan Martin | Israel Start – Up Nation | IRL |
| 92 | André Greipel | Israel Start – Up Nation | NZL |
| 93 | Reto Holllenstein | Israel Start – Up Nation | AUT |
| 94 | Mason Hollyman | Israel Start – Up Nation | ITA |
| 95 | Alex Dowsett | Israel Start – Up Nation | GBR |
| 96 | Michael Woods | Israel Start – Up Nation | CAN |
| 101 | Connor Swift | Team Arkéa – Samsic | GBR |
| 102 | Maxime Bouet | Team Arkéa – Samsic | FRA |
| 103 | Miguel Eduardo Flórez | Team Arkéa – Samsic | COL |
| 104 | Dan McLay | Team Arkéa – Samsic | GBR |
| 105 | Lukasz Owsian | Team Arkéa – Samsic | POL |
| 106 | Bram Welten | Team Arkéa – Samsic | NED |
| 111 | Marc Soler | Movistar Team | ESP |
| 112 | Dario Cataldo | Movistar Team | ESP |
| 113 | Juri Hollmann | Movistar Team | TBC |
| 114 | Gabriel Cullaigh | Movistar Team | GBR |
| 115 | Matteo Jorgenson | Movistar Team | USA |
| 116 | Gregor Mühlberger | Movistar Team | AUT |
| 121 | James Shaw | Ribble Weldtite Pro Cycling | GBR |
| 122 | Dan Bigham | Ribble Weldtite Pro Cycling | GBR |
| 123 | Matt Gibson | Ribble Weldtite Pro Cycling | GBR |
| 124 | Gruff Lewis | Ribble Weldtite Pro Cycling | GBR |
| 125 | Charles Page | Ribble Weldtite Pro Cycling | GBR |
| 126 | Simon Wilson | Ribble Weldtite Pro Cycling | GBR |
| 131 | Mark Donovan | Team DSM | GBR |
| 132 | Romain Combaud | Team DSM | FRA |
| 133 | Nils Eekhoff | Team DSM | NED |
| 134 | Max Kanter | Team DSM | GER |
| 135 | Tim Naberman | Team DSM | NED |
| 136 | Nicholas Roche | Team DSM | IRL |
| 141 | Steve Lampier | Saint Piran | GBR |
| 142 | Ross Holland | Saint Piran | GBR |
| 143 | Oliver Maxwell | Saint Piran | GBR |
| 144 | Tom Mazzone | Saint Piran | GBR |
| 145 | Bradley Symonds | Saint Piran | GBR |
| 146 | Leon Mazzone | Saint Piran | GBR |
| 151 | Nic Dlamini | Team Qhubeka NextHash | RSA |
| 152 | Carlos Barbero | Team Qhubeka NextHash | ESP |
| 153 | Sean Bennett | Team Qhubeka NextHash | USA |
| 154 | Simon Clarke | Team Qhubeka NextHash | AUS |
| 155 | Mauro Schmid | Team Qhubeka NextHash | SUI |
| 156 | Giacomo Nizzolo | Team Qhubeka NextHash | POL |
| 161 | Chris Latham | SwiftCarbon Pro Cycling | GBR |
| 162 | Will Bjergfelt | SwiftCarbon Pro Cycling | GBR |
| 163 | Ross Lamb | SwiftCarbon Pro Cycling | GBR |
| 164 | Andrew Turner | SwiftCarbon Pro Cycling | IRL |
| 165 | Oliver Peckover | SwiftCarbon Pro Cycling | GBR |
| 166 | Alex Peters | SwiftCarbon Pro Cycling | GBR |
| 171 | Thomas Gloag | TRINITY Racing | GBR |
| 172 | Christopher Blevins | TRINITY Racing | GBR |
| 173 | Ben Healy | TRINITY Racing | IRL |
| 174 | Luke Lamperti | TRINITY Racing | USA |
| 175 | Rudy Porter | TRINITY Racing | GBR |
| 176 | Max Walker | TRINITY Racing | GBR |
