| Under-17 Women 300 Metres |
| 39.36 | Olivia Hines | Herne Hill Harriers | Sheffield | 29/07/2000 |
| 38.98 | Twinelle Hopeson | Croydon Harriers | Kingston | 10/05/2008 |
| 38.91 | Amy Allcock | Aldershot, Farnham & District AC | Bath | 30/08/2008 |
| 38.68 | Amy Allcock | Aldershot, Farnham & District AC | Sheffield | 11/07/2009 |
| 38.2 | Holly Ryan | Shaftesbury Barnet Harriers | Watford | 18/05/2025 |
| KEY |
| | i Indoor performance | |
| | * Old specification javelin | |
| | mx Performance achieved in mixed sex race | |
| NOTE. A 3-character code between the club and the venue indicates that the athlete was not eligible to represent GB at the time of the performance but did have a Surrey County qualification. |
