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| European Junior (U20) Championships, 15-18 July, 2021, Tallinn, Estonia | Representing |
| 15 July | Under-20 Men | 3000 Metres | HEAT 1 | 2 | Will Barnicoat | (Windsor, Slough, Eton & Hounslow AC) | 8:25.62 | Q | | Great Britain & Northern Ireland |
| 16 July | Under-20 Men | 200 Metres | HEAT 3 | 3 | Derek Kinlock | (Croydon Harriers) | 21.04/+1.2 | Q | | Great Britain & Northern Ireland |
| 16 July | Under-20 Women | 100 Metres Hurdles (84.0cm) | HEAT 5 | 5 | Mallory Cluley | (Blackheath & Bromley Harriers AC) | 13.88/+3.1 | q | | Great Britain & Northern Ireland |
| 16 July | Under-20 Women | 100 Metres Hurdles (84.0cm) | S-FINAL 2 | 7 | Mallory Cluley | (Blackheath & Bromley Harriers AC) | 13.95/+0.3 | | | Great Britain & Northern Ireland |
| 17 July | Under-20 Men | 200 Metres | S-FINAL 2 | 1 | Derek Kinlock | (Croydon Harriers) | 20.97/-0.5 | Q | | Great Britain & Northern Ireland |
| 17 July | Under-20 Men | 200 Metres | FINAL | 1 | Derek Kinlock | (Croydon Harriers) | 20.72/+0.7 | | | Great Britain & Northern Ireland |
| 17 July | Under-20 Men | 3000 Metres | FINAL | 5 | Will Barnicoat | (Windsor, Slough, Eton & Hounslow AC) | 8:20.36 | | | Great Britain & Northern Ireland |
| 18 July | Under-20 Women | 5000 Metres | FINAL | 12 | Ellen Weir | (Hercules Wimbledon AC) | 17:06.95 | | | Great Britain & Northern Ireland |
