The 2021 GK Championships were held on May 22 in Laugardalur, Iceland.
Senior All-Around Results
| Rank | Athlete | FX | PH | SR | VT | PB | HB | AA |
| 1 | Dagur Olafsson Gerpla |
11.750 | 13.650 | 11.700 | 13.400 | 12.850 | 11.600 | 74.950 |
| 2 | Jonas Thorisson Gerpla |
13.400 | 10.300 | 12.750 | 13.150 | 11.950 | 12.400 | 73.950 |
| 3 | Martin Bjarni Gerpla |
13.050 | 10.800 | 12.750 | 13.950 | 11.350 | 11.150 | 73.050 |
| 4 | Gudjon Hildarson Gerpla |
11.750 | 8.650 | 10.950 | 13.250 | 11.850 | 10.450 | 66.900 |
| 5 | Atli Valgeirsson Gerpla |
11.600 | 11.300 | 5.100 | 13.000 | 11.800 | 11.300 | 64.100 |
| 6 | Jon Gunnarsson Armann |
—— | 10.750 | 14.150 | —— | 11.950 | 10.150 | 47.000 |
| 7 | Arnthor Jonasson Gerpla |
12.000 | 13.550 | —— | —— | 10.650 | —— | 36.200 |
| 8 | Valdimar Matthiasson Gerpla |
10.600 | 5.000 | —— | 12.700 | —— | —— | 28.300 |
| 9 | Agust Davidsson Gerpla |
—— | 7.950 | —— | —— | —— | —— | 7.950 |
Junior All-Around Results
| Rank | Athlete | FX | PH | SR | VT | PB | HB | AA |
| 1 | Sigurdur Stefansson Fjölnir |
11.500 | 9.590 | 9.650 | 12.250 | 9.650 | 11.150 | 64.150 |
| 2 | David Johannsson Fjölnir |
11.800 | 4.650 | 10.800 | 11.450 | 10.850 | 9.500 | 59.050 |
| 3 | Bjartthor Alexandersson Fjölnir |
10.500 | 7.650 | 10.250 | 11.250 | —— | —— | 39.650 |
The Gymternet 