2023 - Monster Mountain Entry List - 65cc
| Name | Rider No | Sponsor | Team | Hometown | Manufacturer |
| Harley Marczak | 5 | JMR FOUNDATION | Greater Manchester | GAS | |
| Jamie Larkin | 9 | DMX TUNING\MOTOLOKO\LJC RACING | Ireland | GAS | |
| Arthur King | 12 | MOTOXTREME 91 CLOTHING | Wiltshire | KTM | |
| Jett Gardiner | 14 | TEAM MATT GARDINER MX\KTM | Gloucestershire | KTM | |
| Teddy Merriman | 16 | GRT IMPACT KTM | GRT IMPACT KTM | Kent | KTM |
| Jakson Ross | 44 | TWISTED GRIP MX | West Lothian | KTM | |
| Jensen Branney | 51 | LAKELAND MOTORCYCLES | Cumbria | KTM | |
| Elliott Shawyer | 62 | GRT IMPACT KTM | Hampshire | KTM | |
| Dylan Standing | 112 | Kent | YAM | ||
| Tyler Peaty | 124 | HOLESHOT MX\ KENDA\AS3\MOTOVERDE | Berkshire | KTM | |
| Casey Lister | 125 | TS RACING | Staffordshire | GAS | |
| Tommy Wood | 214 | 3FLO CONCEPTS\YAMAHA BLUECRU\LDR | Wiltshire | YAM | |
| Cohen Jagielski | 475 | FASTEDDY\ROCKOIL\MICHELIN | Staffordshire | GAS | |
| Zachary White | 913 | PHIL WHITE CONTRACTORS | Northamptonshire | GAS | |
| Charley Wilcock | 999 | NORA DRS DEVELOPMENT TEAM | Greater Manchester | KTM |