The 2021 All-Japan Senior Championships were held from September 23 through September 26 in Sakata, Japan.
All-Around Results
| Rank | Athlete | Club | VT | UB | BB | FX | AA |
| 1 | Miyata Shoko | Sabae High School | 14.766 | 13.233 | 13.166 | 13.533 | 54.698 |
| 2 | Yamada Chiharu | Asahi Life | 14.433 | 13.500 | 12.933 | 12.866 | 53.732 |
| 3 | Ashikawa Urara | Shizuoka Shimbun SBS | 13.233 | 12.166 | 14.166 | 12.966 | 53.531 |
| Hatakeda Chiaki | fuCentral Sports | 13.233 | 12.866 | 12.866 | 13.566 | 52.531 | |
| 5 | Iseki Minori | Tochigi Sports | 14.000 | 11.966 | 12.233 | 12.900 | 51.099 |
| 6 | Uchiyama Yuki | Tochigi Sports | 13.433 | 12.366 | 12.666 | 12.333 | 50.798 |
| 7 | Milka Gehani | Asahi Life | 13.466 | 12.033 | 11.933 | 12.200 | 49.632 |
| 8 | Yamamoto Nanami | Sabae High School | 13.400 | 12.500 | 12.233 | 11.300 | 49.433 |
| 9 | Suzuki Mirai | Try Gymnastics | 13.666 | 11.833 | 11.566 | 12.366 | 49.431 |
| 10 | Takagi Rei | Asahi Life | 13.300 | 11.666 | 12.266 | 11.966 | 49.198 |
| 11 | Mito Natsumi | Sohgoh Gymnastics | 13.166 | 12.466 | 10.833 | 12.600 | 49.065 |
| 12 | Haruguchi Seri | Try Gymnastics | 13.500 | 11.300 | 12.200 | 11.933 | 48.933 |
| 13 | Iwasaki Natsume | Asahi Life | 13.333 | 11.566 | 11.933 | 11.800 | 48.632 |
| 14 | Watanabe Kotomi | Shizuoka Sangyo Club | 13.200 | 11.433 | 12.066 | 11.833 | 48.532 |
| 15 | Miyakawa Sae | Sun Music | 12.900 | 12.000 | 11.700 | 11.833 | 48.433 |
| 16 | Tashiro Aoi | Try Gymnastics | 13.266 | 12.200 | 10.266 | 12.133 | 47.865 |
| 17 | Sekizuka Yui | Try Gymnastics | 12.600 | 11.333 | 11.933 | 11.966 | 47.832 |
| 18 | Suzuki Nina | Zero Gymnastics | 12.333 | 11.366 | 11.133 | 11.800 | 46.632 |
| 19 | Takezawa Chizuru | Osaka University | 12.900 | 11.533 | 11.200 | 10.600 | 46.233 |
| 20 | Osa Yuri | Sabae High School | 12.066 | 11.133 | 11.300 | 11.700 | 46.199 |
| 21 | Fujiwara Mirea | Asahi Life | 13.066 | 11.600 | 9.900 | 11.466 | 46.032 |
| 22 | Yamamoto Rina | Sabae High School | 13.100 | 12.133 | 10.166 | 10.600 | 45.999 |
| 23 | Hasegawa Koto | Asahi Life | 12.966 | 11.966 | 11.133 | 9.500 | 45.565 |
| 24 | Okiyama Yuri | Try Gymnastics | 12.733 | 9.666 | 9.800 | 11.466 | 43.665 |
| 25 | Kondo Tamaki | Sabae High School | 12.133 | 11.233 | 8.833 | 9.200 | 41.399 |
| 26 | Okusa Karen | Oizumi Swallow | 11.600 | 8.533 | 8.200 | 9.533 | 37.866 |
| 27 | Shibasaki Norika | OSU Club | 11.900 | 5.700 | 9.600 | 9.233 | 36.433 |
| 28 | Akiyama Kyoka | Tosu Gymnastics | 12.000 | 6.666 | 8.000 | 8.400 | 35.066 |
| 29 | Toyama Yuika | Sabae High School | —— | 12.233 | 9.500 | —— | 21.733 |
| 30 | Oguchi Mana | Oizumi Swallow | —— | —— | 12.333 | —— | 12.233 |
The Gymternet 