Final
jeudi 20 mai 2021, 17h22 GMT – 17h22 GMT
| Nom | Équipe | Temps | |
|---|---|---|---|
| 1 |  James Guy | Great Britain | 3′ 38.82″ |
| 1 | Adam Peaty | Great Britain | + 0″ |
| 1 | Kathleen Dawson | Great Britain | + 0″ |
| 1 | Anna Hopkin | Great Britain | + 0″ |
| 2 |  Arno Kamminga | Netherlands | + 2.46″ |
| 2 | Femke Heemskerk | Netherlands | + 2.46″ |
| 2 | Kira Toussaint | Netherlands | + 2.46″ |
| 2 | Nyls Korstanje | Netherlands | + 2.46″ |
| 3 |  Nicolò Martinenghi | Italy | + 3.48″ |
| 3 | Margherita Panziera | Italy | + 3.48″ |
| 3 | Alessandro Miressi | Italy | + 3.48″ |
| 3 | Elena Di Liddo | Italy | + 3.48″ |
| 4 | Kliment Kolesnikov | Russia | + 4.78″ |
| 4 | Yuliya Efimova | Russia | + 4.78″ |
| 4 | Mariya Kameneva | Russia | + 4.78″ |
| 4 | Andrey Minakov | Russia | + 4.78″ |
| 5 |  Maria Ugolkova | Switzerland | + 7.34″ |
| 5 | Noè Ponti | Switzerland | + 7.34″ |
| 5 | Lisa Mamie | Switzerland | + 7.34″ |
| 5 | Roman Mityukov | Switzerland | + 7.34″ |
| 6 | Viktar Staselovich | Belarus | + 8″ |
| 6 |  Ilya Shymanovich | Belarus | + 8″ |
| 6 | Anastasiya Shkurdai | Belarus | + 8″ |
| 6 | Anastasiya Kuliashova | Belarus | + 8″ |
| 7 |  Kacper Stokowski | Poland | + 10.2″ |
| 7 | Kasia Wasick | Poland | + 10.2″ |
| 7 | Jan Kalusowski | Poland | + 10.2″ |
| 7 | Paulina Peda | Poland | + 10.2″ |
| 8 | Jessica Vall | Spain | + 11.08″ |
| 8 | Lidón Muñoz | Spain | + 11.08″ |
| 8 | Nicolás García | Spain | + 11.08″ |
| 8 | Alberto Lozano | Spain | + 11.08″ |