The 2021 Danish Junior Championships were held from October 2 through October 3 in Kastrup, Denmark.
All-Around Results
| Rank | Athlete | Club | VT | UB | BB | FX | AA |
| 1 | Natalie Jensen | KG66 | 13.600 | 11.233 | 12.300 | 12.666 | 49.799 |
| 2 | Sara Jacobsen | KG66 | 13.700 | 11.500 | 11.466 | 12.033 | 48.699 |
| 3 | Amalie Pedersen | KG66 | 12.500 | 10.333 | 11.033 | 12.033 | 45.899 |
| 4 | Caroline Bertelsen | AIG | 12.966 | 10.100 | 10.533 | 11.366 | 44.965 |
| 5 | Frida Rasmussen | KG66 | 12.300 | 9.666 | 11.033 | 11.366 | 44.365 |
| 6 | Clara Frandsen | KG66 | 12.966 | 10.066 | 9.133 | 11.866 | 44.031 |
| 7 | Hannah Lassen | Gefion | 12.466 | 9.300 | 11.133 | 10.966 | 43.865 |
| 8 | Solja Müller | KG66 | 12.066 | 8.366 | 10.700 | 10.833 | 41.965 |
| 9 | Gunnva Mørkøre | KG66 | 12.366 | 8.300 | 10.066 | 11.100 | 41.832 |
| 10 | Isabell Andersen | Gefion | 11.900 | 8.500 | 9.933 | 11.266 | 41.599 |
| 11 | Maria Hebbelstrup | AIG | 11.033 | 9.366 | 9.633 | 11.200 | 41.232 |
| 12 | Camilla Knudsen | KG66 | 12.233 | 6.433 | 10.200 | 11.133 | 39.999 |
| 13 | Rosa Zunino | KG66 | 11.600 | 7.000 | 10.700 | 9.700 | 39.000 |
| 14 | Signe Dahl | VIK | 11.733 | 6.800 | 8.800 | 11.266 | 38.599 |
| 15 | Solvej Thomsen | AIG | 11.166 | 8.466 | 8.400 | 10.066 | 38.098 |
| 16 | Alberte Winding | HGF | 12.166 | 0.900 | 8.533 | 10.733 | 32.332 |
| 17 | Ida Vilsgaard | VIK | 11.033 | —— | 10.133 | 9.733 | 30.899 |
| 18 | Katrine Grovn | Gefion | 10.966 | —— | 8.833 | 9.533 | 29.332 |
| 19 | Olivia Myllerup | VIK | 12.300 | 6.800 | 6.966 | —— | 26.066 |
| 20 | Andrea Jensen | HGF | —— | —— | 9.600 | —— | 9.600 |
| 21 | Lili Sørensen | Gefion | —— | 8.166 | —— | —— | 8.166 |
Vault Final Results
| Rank | Athlete | Club | Vault 1 | Vault 2 | Average |
| 1 | Sara Jacobsen | KG66 | 14.033 | 14.233 | 14.133 |
| 2 | Natalie Jensen | KG66 | 13.300 | 13.733 | 13.517 |
| 3 | Amalie Pedersen | KG66 | 13.166 | 12.966 | 13.066 |
| 4 | Clara Frandsen | KG66 | 13.000 | 13.066 | 13.033 |
| 5 | Frida Rasmussen | KG66 | 12.400 | 12.733 | 12.567 |
| 6 | Hannah Lassen | Gefion | 12.133 | 12.533 | 12.333 |
Bars Final Results
| Rank | Athlete | Club | D | E | ND | Total |
| 1 | Sara Jacobsen | KG66 | 3.2 | 8.266 | 11.466 | |
| 2 | Natalie Jensen | KG66 | 2.7 | 8.366 | 11.066 | |
| 3 | Caroline Bertelsen | AIG | 2.5 | 8.366 | 10.866 | |
| 4 | Amalie Pedersen | KG66 | 1.5 | 9.000 | 10.500 | |
| 5 | Frida Rasmussen | KG66 | 1.3 | 8.700 | 10.000 | |
| 6 | Clara Frandsen | KG66 | 1.3 | 8.666 | 9.966 |
Beam Final Results
| Rank | Athlete | Club | D | E | ND | Total |
| 1 | Natalie Jensen | KG66 | 4.7 | 7.266 | 11.966 | |
| 2 | Amalie Pedersen | KG66 | 3.6 | 7.766 | 11.366 | |
| 3 | Sara Jacobsen | KG66 | 4.1 | 6.800 | 10.900 | |
| 4 | Hannah Lassen | Gefion | 3.9 | 6.000 | 9.900 | |
| 5 | Frida Rasmussen | KG66 | 4.4 | 5.166 | 9.566 | |
| 6 | Rosa Zunino | KG66 | 3.4 | 6.000 | 9.400 |
Floor Final Results
| Rank | Athlete | Club | D | E | ND | Total |
| 1 | Sara Jacobsen | KG66 | 4.5 | 8.000 | 12.500 | |
| 2 | Amalie Pedersen | KG66 | 4.0 | 8.233 | -0.1 | 12.133 |
| 3 | Natalie Jensen | KG66 | 4.3 | 8.100 | -0.3 | 12.100 |
| 4 | Caroline Bertelsen | AIG | 3.8 | 8.200 | -0.3 | 11.700 |
| 5 | Frida Rasmussen | KG66 | 3.4 | 7.266 | 10.666 | |
| 6 | Clara Frandsen | KG66 | 3.5 | 6.900 | -0.1 | 10.300 |
Team Final Results
| Rank | Club | VT | UB | BB | FX | Total |
| 1 | KG66 KASTRUP 1 (Clara Frandsen, Sara Jacobsen, Natalie Jensen, Amalie Pedersen, Frida Rasmussen) | 40.266 | 33.066 | 34.799 | 36.732 | 144.863 |
| 2 | KGG KASTRUP 2 (Camilla Knudsen, Gunnva Mørkøre, Solja Müller, Rosa Zunino) | 36.665 | 23.666 | 31.600 | 33.066 | 124.997 |
| 3 | AALBORG IDRAETS GYMNASTIKFORENING (Caroline Bertelsen, Maria Hebbelstrup, Solvej Thomsen) | 35.165 | 27.932 | 28.566 | 32.632 | 124.295 |
| 4 | GEFION (Isabell Andersen, Katrine Grovn, Hannah Lassen, Lili Sørensen) | 35.332 | 25.966 | 29.899 | 31.765 | 122.962 |