The 2021 Korean National Sports Festival was held from October 8 through October 10 in Pohang, South Korea.
All-Around Results
| Rank | Athlete | FX | PH | SR | VT | PB | HB | AA |
| 1 | Seo Jungwon Gwangju Athletic High School |
13.500 | 12.067 | 13.833 | 13.300 | 13.967 | 12.733 | 79.400 |
| 2 | Lee Gwihyeon Gwangju Athletic High School |
13.200 | 12.600 | 12.500 | 13.767 | 13.067 | 12.833 | 77.967 |
| 3 | Park Seungho Seoul Sports High School |
12.867 | 12.467 | 12.133 | 13.633 | 12.933 | 13.067 | 77.100 |
| 4 | Ahn Junhyeok Pohang High School |
12.600 | 13.433 | 12.133 | 13.500 | 12.567 | 12.033 | 76.266 |
| 5 | Kim Haneul Suwon High School |
11.900 | 10.967 | 12.867 | 12.667 | 12.533 | 13.367 | 74.301 |
| 6 | Heo Kangmin Suwon High School |
12.067 | 11.633 | 12.667 | 12.067 | 13.033 | 12.567 | 74.034 |
| 7 | Kim Jongmin Seoul Sports High School |
12.567 | 11.533 | 11.567 | 12.633 | 12.700 | 11.667 | 72.667 |
| 8 | Seol Seonhoon Jeonbuk Athletic High School |
12.233 | 11.200 | 11.067 | 12.600 | 13.367 | 12.133 | 72.600 |
| 9 | Cho Hyunseong Incheon Sports High School |
12.933 | 10.100 | 11.467 | 13.233 | 11.467 | 11.767 | 70.967 |
| 10 | Kim Dohoon Pohang High School |
11.333 | 11.700 | 10.000 | 12.733 | 12.367 | 12.467 | 70.600 |
| 11 | Moon Kyungsoo Gwangju Athletic High School |
11.733 | 13.000 | 11.000 | 12.133 | 11.167 | 11.267 | 70.300 |
| 12 | Lee Kijoo Suwon High School |
13.267 | 10.133 | 11.567 | 12.267 | 11.033 | 11.700 | 69.967 |
| 13 | Son Mingyu Pohang High School |
12.600 | 8.667 | 11.867 | 12.867 | 11.167 | 12.000 | 69.168 |
| 14 | Choi Junho Pohang High School |
11.867 | 9.567 | 12.600 | 12.000 | 11.667 | 11.033 | 68.734 |
| 15 | Ahn Dohyun Chungnam Athletic High School |
11.200 | 12.200 | 12.867 | 12.267 | 10.133 | 9.500 | 68.167 |
| 16 | Gwon Beomsoo Daegu Sports High School |
11.467 | 9.000 | 11.100 | 12.500 | 10.867 | 11.267 | 66.201 |
| 17 | Park Hojin Ulsan High School |
12.300 | 9.400 | 10.600 | 12.333 | 9.700 | 11.333 | 65.666 |
| 18 | Kim Jinkyu Chungbuk Athletic High School |
11.933 | 10.133 | 8.400 | 11.633 | 11.133 | 10.967 | 64.199 |
| 19 | Yeom Jisung Ulsan High School |
11.133 | 9.300 | 9.800 | 11.667 | 10.533 | 10.833 | 63.266 |
| 20 | Jeon Eunsoo Suwon High School |
—— | 10.867 | 14.067 | 11.633 | 12.667 | 12.133 | 61.367 |
| 21 | Park Seonwoo Seoul Sports High School |
12.300 | —— | 10.867 | 13.600 | 12.767 | 11.833 | 61.367 |
| 22 | Ham Chaewoo Incheon Sports High School |
9.767 | 8.300 | 10.267 | 11.400 | 10.733 | 9.500 | 59.967 |
| 23 | Cho Hanhwi Seoul Sports High School |
12.000 | 11.100 | 11.867 | —— | 12.433 | 12.300 | 59.700 |
| 24 | Yoon Dongmin Gwangju Athletic High School |
11.100 | 8.633 | 8.467 | 11.300 | 9.867 | 9.833 | 59.200 |
| 25 | Park Jeongjun Busan Sports High School |
13.200 | 4.100 | 10.367 | 12.667 | 10.867 | 5.700 | 56.901 |
| 26 | Cho Chansol Busan Sports High School |
12.867 | 4.467 | 10.633 | 12.500 | 10.233 | 5.667 | 56.367 |
| 27 | Jeon Gunsu Chungnam Athletic High School |
10.333 | 7.400 | 9.333 | 10.667 | 9.100 | 9.067 | 55.900 |
| 28 | Kim Hyunjong Daejeon Athletic High School |
12.300 | —— | 9.867 | 12.967 | 10.567 | 9.933 | 55.634 |
| 29 | Kim Taesung Gangwon Athletic High School |
9.200 | 6.867 | 9.200 | 9.833 | 10.033 | 8.767 | 53.900 |
| 30 | Kim Hyunggyu Gyeongnam Athletic High School |
10.933 | 8.500 | 8.267 | 12.000 | 9.867 | 3.067 | 52.634 |
| 31 | Kim Hansae Chungnam Athletic High School |
12.067 | 3.733 | 5.533 | 13.767 | 8.667 | 8.400 | 52.167 |
| 32 | Kim Kwanwoo Chungnam Athletic High School |
10.933 | —— | 9.033 | 11.700 | 9.800 | 10.267 | 51.733 |
| 33 | Kim Hyunggi Ulsan High School |
5.733 | 8.867 | 9.500 | 10.633 | 6.267 | 10.133 | 51.133 |
| 34 | Oh Taekgon Gyeongnam Athletic High School |
9.933 | 4.300 | 10.967 | 12.067 | 10.700 | 3.133 | 51.100 |
| 35 | Kim Jimin Busan Sports High School |
11.867 | 3.433 | 9.133 | 10.167 | 10.200 | 5.500 | 50.300 |
| 36 | Kim Woojoo Incheon Sports High School |
10.400 | 2.800 | 9.100 | 11.400 | 11.233 | 5.300 | 50.233 |
| 37 | Chae Subyeong Seoul Sports High School |
—— | 10.767 | 11.267 | —— | 12.700 | 12.867 | 47.601 |
| 38 | Park Dongjun Chungbuk Athletic High School |
9.967 | 3.700 | 4.233 | 11.533 | 5.467 | 9.767 | 44.667 |
| 39 | Jang Seongwook Incheon Sports High School |
—— | 7.633 | 8.367 | 11.533 | 10.767 | 5.167 | 43.467 |
| 40 | Park Han byul Busan Sports High School |
6.067 | 3.233 | 10.267 | 10.400 | 10.500 | 2.333 | 42.800 |
| 41 | Lee Yoonjae Chungbuk Athletic High School |
6.633 | 8.000 | 8.333 | 12.133 | 3.067 | 2.667 | 40.833 |
| 42 | Baek Doosan Suwon High School |
12.467 | —— | 12.667 | 13.467 | —— | —— | 38.601 |
| 43 | Oh Jaeho Daejeon Athletic High School |
10.233 | —— | 9.933 | —— | 10.167 | 5.833 | 36.166 |
| 44 | Park Hwapyung Daejeon Athletic High School |
8.667 | 5.033 | —— | 9.933 | —— | 10.167 | 33.800 |
| 45 | Son Euidam Gyeongnam Athletic High School |
11.333 | 4.967 | 8.033 | —— | 3.367 | —— | 27.700 |
| 46 | Kim Taewoo Gangwon Athletic High School |
3.733 | 0.900 | 8.700 | 9.667 | 1.200 | 1.600 | 25.800 |
| 47 | Yoon Donggun Seoul Sports High School |
12.933 | —— | —— | 12.433 | —— | —— | 25.366 |
| 48 | Kim Onyu Seoul Sports High School |
—— | 11.767 | —— | 13.067 | —— | —— | 24.834 |
| 49 | Kim Jinwoong Suwon High School |
—— | 11.800 | —— | —— | —— | 12.867 | 24.667 |
| 50 | Noh Seongjong Gwangju Athletic High School |
11.033 | —— | —— | 10.367 | —— | —— | 21.400 |
| 51 | Im Sehyeon Jeonnam Sports High School |
6.200 | —— | —— | 9.700 | —— | —— | 15.900 |
| 52 | Jeon Seongbae Suwon High School |
—— | —— | —— | —— | 11.833 | —— | 11.833 |
| 53 | Jeon Hyunsoo Chungnam Athletic High School |
—— | 6.067 | —— | —— | —— | —— | 6.067 |
Floor Final Results
| Rank | Athlete | Team | D | E | ND | Total |
| 1 | Lee Gwihyeon | Gwangju Athletic High School | 5.9 | 8.100 | 14.000 | |
| 2 | Seo Jungwon | Gwangju Athletic High School | 5.7 | 8.175 | 13.875 | |
| 3 | Cho Hyunseong | Incheon Sports High School | 5.4 | 8.100 | 13.500 | |
| 4 | Yoon Donggun | Seoul Sports High School | 5.3 | 7.500 | 12.800 | |
| 5 | Cho Chansol | Busan Sports High School | 5.2 | 7.575 | 12.775 | |
| 6 | Park Seungho | Seoul Sports High School | 5.7 | 6.700 | -0.1 | 12.300 |
| 7 | Lee Kijoo | Suwon High School | 5.4 | 6.475 | 11.875 | |
| 8 | Park Jeongjun | Busan Sports High School | 5.4 | 6.175 | 11.575 |
Pommels Final Results
| Rank | Athlete | Team | D | E | ND | Total |
| 1 | Park Seungho | Seoul Sports High School | 5.6 | 8.100 | 13.700 | |
| 2 | Lee Gwihyeon | Gwangju Athletic High School | 5.1 | 7.375 | 12.475 | |
| 3 | Kim Dohoon | Pohang High School | 5.0 | 7.250 | 12.250 | |
| 4 | Ahn Junhyeok | Pohang High School | 5.7 | 6.525 | 12.225 | |
| 5 | Moon Kyungsoo | Gwangju Athletic High School | 4.7 | 7.225 | 11.925 | |
| 6 | Ahn Dohyun | Chungnam Athletic High School | 4.2 | 7.575 | 11.775 | |
| 7 | Kim Jinwoong | Suwon High School | 4.1 | 6.650 | 10.750 | |
| 8 | Kim Onyu | Seoul Sports High School | 4.6 | 6.076 | 10.675 |
Rings Final Results
| Rank | Athlete | Team | D | E | ND | Total |
| 1 | Seo Jungwon | Gwangju Athletic High School | 5.6 | 8.350 | 13.950 | |
| 2 | Park Seungho | Seoul Sports High School | 4.8 | 7.850 | 12.650 | |
| 3 | Kim Haneul | Suwon High School | 4.5 | 8.025 | 12.525 | |
| 4 | Choi Junho | Pohang High School | 5.0 | 7.425 | 12.425 | |
| 5 | Ahn Dohyun | Chungnam Athletic High School | 4.9 | 7.400 | 12.300 | |
| 6 | Jeon Eunsoo | Suwon High School | 5.6 | 6.475 | 12.075 |
Vault Final Results
| Rank | Athlete | Team | D | E | ND | Total | |
| 1 | Lee Kijoo | Suwon High School | 5.2 | 9.050 | 14.250 | 14.150 | |
| 4.8 | 9.250 | 14.050 | |||||
| 2 | Lee Gwihyeon | Gwangju Athletic High School | 5.2 | 8.950 | 14.150 | 13.938 | |
| 4.8 | 8.925 | 13.725 | |||||
| 3 | Kim Hyunjong | Daejeon Athletic High School | 5.2 | 8.700 | 13.900 | 13.750 | |
| 4.8 | 8.800 | 13.600 | |||||
| 4 | Kim Hansae | Chungnam Athletic High School | 4.8 | 8.750 | 13.550 | 13.638 | |
| 5.2 | 8.525 | 13.725 | |||||
| Seo Jungwon | Gwangju Athletic High School | 5.2 | 8.575 | -0.1 | 13.675 | 13.638 | |
| 4.8 | 8.800 | 13.600 | |||||
| 6 | Cho Hyunseong | Incheon Sports High School | 4.8 | 8.450 | 13.250 | 13.338 | |
| 4.8 | 8.625 | 13.425 | |||||
| 7 | Ahn Junhyeok | Pohang High School | 4.8 | 8.525 | -0.1 | 13.225 | 13.125 |
| 4.4 | 8.625 | 13.025 | |||||
| 8 | Son Mingyu | Pohang High School | 4.8 | 8.425 | 13.225 | 13.050 | |
| 4.4 | 8.475 | 12.875 |
P-Bars Final Results
| Rank | Athlete | Team | D | E | ND | Total |
| 1 | Seo Jungwon | Gwangju Athletic High School | 5.8 | 7.925 | 13.725 | |
| 2 | Park Seungho | Seoul Sports High School | 4.6 | 8.075 | 12.675 | |
| 3 | Lee Gwihyeon | Gwangju Athletic High School | 4.8 | 7.825 | 12.625 | |
| 4 | Jeon Eunsoo | Suwon High School | 5.2 | 7.250 | 12.450 | |
| 5 | Ahn Junhyeok | Pohang High School | 4.2 | 8.150 | 12.350 | |
| 6 | Seol Seonhoon | Jeonbuk Athletic High School | 4.7 | 7.625 | 12.325 | |
| 7 | Heo Kangmin | Suwon High School | 4.8 | 7.150 | 11.950 | |
| 8 | Park Seonwoo | Seoul Sports High School | 4.7 | 6.550 | 11.250 |
High Bar Final Results
| Rank | Athlete | Team | D | E | ND | Total |
| 1 | Kim Haneul | Suwon High School | 4.9 | 8.000 | 12.900 | |
| 2 | Park Seungho | Seoul Sports High School | 4.7 | 8.175 | 12.875 | |
| 3 | Chae Subyeong | Seoul Sports High School | 4.7 | 7.800 | 12.500 | |
| 4 | Lee Gwihyeon | Gwangju Athletic High School | 4.8 | 7.650 | 12.450 | |
| 5 | Seo Jungwon | Gwangju Athletic High School | 4.7 | 7.700 | 12.400 | |
| 6 | Seol Seonhoon | Jeonbuk Athletic High School | 4.2 | 7.725 | 11.925 | |
| 7 | Kim Dohoon | Pohang High School | 4.7 | 7.175 | 11.875 | |
| 8 | Kim Jinwoong | Suwon High School | 4.7 | 6.650 | 11.350 |