The 2021 South Korean Championships were held from May 1 through May 2 in Hongcheon, South Korea.
General All-Around Results
| Rank | Athlete | FX | PH | SR | VT | PB | HB | AA |
| 1 | Lee Junho Jeonbuk |
14.150 | 12.850 | 13.750 | 14.700 | 12.250 | 14.000 | 81.700 |
| 2 | Lee Junghyo POSCO E&C |
13.350 | 14.150 | 13.250 | 14.200 | 13.550 | 12.600 | 81.100 |
| 3 | Lee Hyukjoong Jeonbuk |
13.550 | 13.300 | 13.100 | 13.500 | 13.350 | 13.400 | 80.200 |
| 4 | Lee Jangwon Gangwon |
13.500 | 12.000 | 13.750 | 13.700 | 12.500 | 12.850 | 78.300 |
| 5 | Im Changdo Gangwon |
12.250 | 12.100 | 13.150 | 12.850 | 12.400 | 12.950 | 75.700 |
| 6 | Moon Kyuyong Army Sports Unit |
12.250 | 12.350 | 13.050 | 13.400 | 12.300 | 12.250 | 75.600 |
| 7 | Ryu Jihyuk Incheon |
12.950 | 10.500 | 13.550 | 13.000 | 12.400 | 11.900 | 74.300 |
| 8 | Nam Youngil Incheon |
11.750 | 10.000 | 13.550 | 12.400 | 12.900 | 12.650 | 73.250 |
| 9 | Kim Seongyeon Army Sports Unit |
12.600 | 10.900 | 12.750 | 13.600 | 11.250 | 12.100 | 73.200 |
| 10 | Kang Pyunghwan Gyeongnam |
12.750 | 8.350 | 13.600 | 13.600 | 10.800 | 12.650 | 71.750 |
| 11 | Yeom Sangjun Gyeongnam |
11.550 | 8.900 | 13.100 | 13.650 | 12.700 | 11.650 | 71.550 |
| 12 | Kim Jongdeok Jeonbuk |
13.550 | —— | 12.400 | 13.700 | 12.850 | 12.600 | 65.100 |
| 13 | Bae Garam Army Sports Unit |
13.100 | 12.200 | 13.350 | —— | 13.450 | 12.500 | 64.600 |
| 14 | Shin Donghyun Incheon |
11.650 | 12.550 | 12.550 | 13.600 | 13.300 | —— | 63.650 |
| 15 | Kim Soomyeon POSCO E&C |
11.000 | 12.100 | —— | 13.500 | 13.000 | 13.250 | 62.850 |
| 16 | Kim Yunhwan POSCO E&C |
11.850 | 12.050 | —— | 12.600 | 12.450 | 13.450 | 62.400 |
| 17 | Kim Donghwi Gangwon |
12.450 | 9.850 | 12.300 | 13.750 | 12.450 | —— | 60.800 |
| 18 | Lee Jaesung Gangwon |
12.050 | 10.400 | 13.350 | —— | 10.700 | 13.250 | 59.750 |
| 19 | Lee Sangmin Gyeongnam |
11.650 | 11.200 | 12.200 | —— | 12.700 | 10.350 | 58.100 |
| 20 | Park Minsoo Army Sports Unit |
—— | 13.300 | 14.000 | —— | 13.350 | 13.000 | 53.650 |
| 21 | Yun Jinseong POSCO E&C |
—— | 11.950 | 13.750 | —— | 13.250 | 13.950 | 52.900 |
| 22 | Kim Jinkwon Jeonbuk |
11.700 | 12.650 | 14.450 | 12.950 | —— | —— | 51.750 |
| 23 | Cho Youngkwang Army Sports Unit |
—— | 11.450 | 12.600 | —— | 13.700 | 12.600 | 50.350 |
| 24 | Go Yedam POSCO E&C |
—— | 10.250 | 13.350 | —— | 12.950 | 13.650 | 50.200 |
| 25 | Kang Honggoo Jeonbuk |
11.700 | —— | 11.750 | —— | 12.200 | 13.650 | 49.300 |
| 26 | Chae Jungwon Gyeongnam |
12.100 | —— | 11.100 | 12.800 | 11.050 | —— | 47.050 |
| 27 | Na Hyunwoong Incheon |
—— | 12.450 | 11.100 | —— | 11.350 | 11.950 | 46.850 |
| 28 | Kim Jehyeon Seoul |
—— | 8.100 | —— | 12.300 | 12.400 | 12.750 | 45.550 |
| 29 | Park Eojin POSCO E&C |
13.750 | —— | 13.900 | 13.400 | —— | —— | 41.050 |
| 30 | Kim Yunkyung Gangwon |
13.000 | —— | 14.200 | 13.400 | —— | —— | 40.600 |
| 31 | Hwang Soobin Busan |
13.800 | —— | 13.950 | 12.200 | —— | —— | 39.950 |
| 32 | Lee Sangwook Jeonbuk |
—— | 12.600 | —— | —— | 13.700 | 12.450 | 38.750 |
| 33 | Im Chaekyung POSCO E&C |
12.800 | —— | 12.700 | 12.950 | —— | —— | 38.450 |
| 34 | Kang Joowon Gangwon |
—— | 11.850 | —— | —— | 13.350 | 11.300 | 36.500 |
| 35 | Kim Jinseok Incheon |
12.500 | —— | —— | 12.750 | —— | 10.850 | 36.100 |
| 36 | Koh Gwangjin Busan |
12.050 | 13.200 | —— | —— | —— | 10.400 | 35.650 |
| 37 | Kim Hansol Seoul |
14.600 | —— | —— | 14.950 | —— | —— | 29.550 |
| 38 | Shin Jaehwan Chungbuk |
12.400 | —— | —— | 14.450 | —— | —— | 26.850 |
| 39 | Lee Changkyun Army Sports Unit |
12.050 | —— | —— | 14.500 | —— | —— | 26.550 |
| 40 | Jo Jooyoung Busan |
12.400 | —— | —— | 14.000 | —— | —— | 26.400 |
| 41 | Koh Younghoon Army Sports Unit |
12.900 | —— | —— | 13.100 | —— | —— | 26.000 |
| 42 | Kim Jihan Gyeongnam |
—— | 12.850 | —— | 12.400 | —— | —— | 25.250 |
| 43 | Park Jihwan Seoul |
—— | 13.100 | —— | 11.300 | —— | —— | 24.400 |
| 44 | Jeon Yoseob Jeonbuk |
—— | 12.150 | —— | 12.050 | —— | —— | 24.200 |
| 45 | Ko Yodam Suwon |
—— | 10.650 | —— | —— | 11.450 | —— | 22.100 |
| 46 | Oh Joohyung Gyeonggi |
12.500 | 8.200 | —— | —— | —— | —— | 20.700 |
| 47 | Im Myeongu Suwon |
—— | —— | 14.700 | —— | —— | —— | 14.700 |
| 48 | Kim Jihoon Seoul |
—— | —— | —— | —— | —— | 12.900 | 12.900 |
| 49 | Kang Jaeil Gyeonggi |
—— | —— | —— | —— | 12.200 | —— | 12.200 |
| 50 | Choi Kyubeom Gyeongnam |
—— | —— | —— | —— | —— | 11.400 | 11.400 |
College All-Around Results
| Rank | Athlete | FX | PH | SR | VT | PB | HB | AA |
| 1 | Ryu Sunghyun Korea Sports University |
14.650 | 12.150 | 14.150 | 15.300 | 13.450 | 13.550 | 83.250 |
| 2 | Park Jinho Korea Sports University |
13.450 | 11.850 | 13.650 | 13.750 | 13.250 | 11.400 | 77.350 |
| 3 | Lee Bonkyung Gongju University |
11.750 | 11.450 | 12.800 | 13.400 | 13.300 | 12.000 | 74.700 |
| 4 | Han Changhee Gongju University |
10.350 | 13.000 | 12.350 | 12.250 | 11.550 | 11.100 | 70.600 |
| 5 | Im Kyungbin Jeju International University |
10.900 | 10.700 | 11.800 | 12.750 | 11.350 | 11.800 | 69.300 |
| 6 | Lee Minhyuk Jeju International University |
12.100 | 10.200 | 11.200 | 12.600 | 12.050 | 10.900 | 69.050 |
| 7 | Kim Hamin Gongju University |
11.950 | 11.200 | 11.150 | 11.950 | 11.650 | 10.350 | 68.250 |
| 8 | Gan Hyeonbae Korea Sports University |
12.750 | —— | 13.400 | 13.850 | 13.800 | 12.900 | 66.700 |
| 9 | Kang Minguk Jeju International University |
13.200 | 10.350 | 12.150 | 13.950 | 11.400 | —— | 61.050 |
| 10 | Lee Geon Jeju International University |
12.900 | 6.500 | 11.350 | 13.250 | —— | 10.100 | 54.100 |
| 11 | Kim Minseok Korea Sports University |
—— | 12.200 | 12.250 | —— | 13.150 | 9.950 | 47.550 |
| 12 | Shim Gyuwon Gongju University |
—— | 10.350 | 11.950 | —— | 12.250 | 10.850 | 45.400 |
| 13 | Seo Eunho Gongju University |
10.300 | —— | 11.850 | 11.700 | 10.850 | —— | 44.700 |
| 14 | Lee Kunwoo Gongju University |
8.950 | 9.850 | —— | 13.550 | —— | 10.000 | 42.350 |
| 15 | Ham Myungsik Korea Sports University |
—— | 11.750 | 13.900 | 13.850 | —— | —— | 39.500 |
| 16 | Jo Wonbin Korea Sports University |
12.350 | —— | —— | 13.500 | —— | 12.500 | 38.350 |
| 17 | Heo Woong Korea Sports University |
12.450 | 13.000 | —— | —— | 12.750 | —— | 38.200 |
| 18 | Park Seungok Jeju International University |
—— | 11.000 | —— | —— | 11.450 | 8.950 | 31.400 |
| 19 | Kim Hyobin Jeju International University |
11.050 | —— | —— | 13.800 | —— | —— | 24.850 |
High School All-Around Results
| Rank | Athlete | FX | PH | SR | VT | PB | HB | AA |
| 1 | Seo Jungwon Gwangju Athletic High School |
12.800 | 12.200 | 14.100 | 13.400 | 13.200 | 12.300 | 78.000 |
| 2 | Heo Kangmin Suwon High School |
11.850 | 10.950 | 12.300 | 12.900 | 12.050 | 12.300 | 72.350 |
| 3 | Cho Hanhwi Seoul Sports High School |
12.450 | 11.250 | 12.400 | 12.900 | 11.650 | 11.550 | 72.200 |
| 4 | Kim Haneul Suwon High School |
11.550 | 10.250 | 12.900 | 12.450 | 11.400 | 12.900 | 71.450 |
| 5 | Seol Seonhoon Jeonbuk Athletic High School |
11.350 | 10.350 | 12.000 | 12.700 | 13.250 | 11.800 | 71.450 |
| 6 | Kim Onyu Seoul Sports High School |
11.300 | 10.850 | 12.100 | 13.950 | 11.700 | 11.300 | 71.200 |
| 7 | Moon Kyungsoo Gwangju Athletic High School |
11.700 | 13.000 | 11.850 | 11.650 | 12.150 | 10.800 | 71.150 |
| 8 | Park Seonwoo Seoul Sports High School |
12.200 | 10.850 | 10.900 | 12.150 | 12.400 | 11.750 | 70.250 |
| 9 | Kim Jongmin Seoul Sports High School |
12.500 | 9.650 | 12.100 | 12.900 | 11.100 | 11.900 | 70.150 |
| 10 | Cho Hyunseong Incheon Sports High School |
13.000 | 9.750 | 11.900 | 12.900 | 11.550 | 10.450 | 69.550 |
| 11 | Ahn Joonhyuk Pohang High School |
11.600 | 11.050 | 11.450 | 12.950 | 11.400 | 10.850 | 69.300 |
| 12 | Kim Dohoon Pohang High School |
10.500 | 9.900 | 11.150 | 12.200 | 11.950 | 12.000 | 67.700 |
| 13 | Choi Junho Pohang High School |
11.200 | 8.650 | 12.900 | 12.050 | 11.800 | 10.300 | 66.900 |
| 14 | Son Mingyu Pohang High School |
11.250 | 8.950 | 11.700 | 12.600 | 10.900 | 10.550 | 65.950 |
| 15 | Ahn Dohyeon Chungnam Athletic High School |
11.500 | 11.250 | 12.200 | 9.700 | 9.550 | 9.000 | 63.200 |
| 16 | Lee Kijoo Suwon High School |
13.600 | —— | 11.900 | 13.150 | 11.700 | 12.100 | 62.450 |
| 17 | Park Hojin Ulsan High School |
11.300 | 6.400 | 11.550 | 11.300 | 9.500 | 10.500 | 60.550 |
| 18 | Jeon Eunsoo Suwon High School |
—— | 11.450 | 13.400 | 9.750 | 12.200 | 12.150 | 58.950 |
| 19 | Ham Chaewoo Incheon Sports High School |
11.600 | 6.400 | 9.150 | 11.500 | 9.150 | 9.500 | 57.300 |
| 20 | Kwon Beomsoo Daegu Sports High School |
11.600 | 6.850 | 7.050 | 11.700 | 9.150 | 10.400 | 56.750 |
| 21 | Kim Jinwoong Suwon High School |
10.450 | 10.400 | 12.200 | —— | 11.800 | 11.500 | 56.350 |
| 22 | Kim Woojoo Incheon Sports High School |
9.750 | 6.900 | 8.150 | 11.400 | 10.000 | 9.850 | 56.050 |
| 23 | Kim Hyunjong Daejeon Athletic High School |
12.450 | 3.600 | 10.450 | 14.250 | 9.550 | 5.700 | 56.000 |
| 24 | Yeom Jisung Ulsan High School |
10.500 | 6.000 | 10.350 | 8.700 | 10.850 | 9.000 | 55.400 |
| 25 | Kim Donggyu Chungbuk Athletic High School |
6.750 | 7.400 | 8.750 | 11.600 | 10.150 | 9.400 | 54.050 |
| 26 | Cho Chansol Busan Sports High School |
12.450 | 4.500 | 10.200 | 11.800 | 10.150 | 3.900 | 53.000 |
| 27 | Oh Jaeho Daejeon Athletic High School |
10.300 | 2.350 | 11.000 | 12.200 | 10.100 | 5.300 | 51.250 |
| 28 | Jeon Gunsu Chungnam Athletic High School |
10.350 | 5.650 | 6.400 | 10.400 | 9.050 | 8.500 | 50.350 |
| 29 | Kim Hansae Chungnam Athletic High School |
11.100 | 1.850 | 5.250 | 13.500 | 9.450 | 8.800 | 49.950 |
| 30 | Kim Hyunggyu Gyeongnam Sports High School |
10.900 | 6.100 | 9.000 | 12.300 | 10.100 | 1.500 | 49.900 |
| 31 | Baek Doosan Suwon High School |
12.350 | —— | 11.700 | 13.000 | 11.600 | —— | 48.650 |
| 32 | Park Jeongjun Busan Sports High School |
11.000 | 3.400 | 10.350 | 12.100 | 10.150 | 1.500 | 48.500 |
| 33 | Oh Taekgon Gyeongnam Sports High School |
10.300 | 4.100 | 10.150 | 11.000 | 10.750 | 1.500 | 47.800 |
| 34 | Yoon Donggun Seoul Sports High School |
11.900 | —— | 10.950 | 13.000 | 11.300 | —— | 47.150 |
| 35 | Seol Seonhyeon Jeonbuk Athletic High School |
4.650 | 9.450 | 10.800 | 9.450 | 12.300 | —— | 46.650 |
| 36 | Park Hanbyul Busan Sports High School |
9.900 | 2.450 | 9.800 | 12.500 | 9.200 | 2.000 | 45.850 |
| 37 | Im Eunseong Jeonbuk Athletic High School |
11.700 | 11.950 | —— | 10.500 | —— | 10.100 | 44.250 |
| 38 | Kim Jimin Busan Sports High School |
11.450 | 3.500 | 5.000 | 10.600 | 8.900 | 3.150 | 42.600 |
| 39 | Chae Subyeong Seoul Sports High School |
—— | 11.850 | 11.450 | 9.150 | 10.000 | —— | 42.450 |
| 40 | Kim Taebin Pohang High School |
—— | 9.200 | —— | 11.150 | 10.400 | 10.750 | 41.500 |
| 41 | Yoon Dongmin Gwangju Athletic High School |
5.350 | 7.900 | 4.550 | 9.550 | 9.000 | 3.850 | 40.200 |
| 42 | Kim Taesung Gangwon Athletic High School |
—— | 7.150 | 8.650 | —— | 8.800 | 9.150 | 33.750 |
| 43 | Jeon Seongbae Suwon High School |
10.850 | 9.350 | —— | 12.300 | —— | —— | 32.500 |
| 44 | Park Hwapyung Daejeon Athletic High School |
—— | 7.750 | —— | 11.650 | —— | 12.800 | 32.200 |
| 45 | Kim Hyunggi Ulsan High School |
—— | 2.600 | 9.550 | —— | 9.900 | 10.100 | 32.150 |
| 46 | Son Euidam Gyeongnam Sports High School |
9.500 | —— | 3.750 | 11.600 | 2.200 | —— | 27.050 |
| 47 | Lee Yoonjae Chungbuk Athletic High School |
5.100 | 7.000 | —— | 11.150 | —— | —— | 23.250 |
| 48 | Kim Kyungjoo Seoul Sports High School |
—— | 11.650 | —— | —— | —— | 11.550 | 23.200 |
| 49 | Kim Taewoo Gangwon Athletic High School |
2.650 | 1.200 | 4.050 | 9.850 | 3.850 | 1.000 | 22.600 |
| 50 | Noh Seongjong Gwangju Athletic High School |
10.500 | —— | —— | 10.250 | —— | —— | 20.750 |
| 51 | Im Sehyeon Jeonnam Sports High School |
5.300 | —— | —— | 9.750 | —— | —— | 15.050 |
| 52 | Kim Jinkyu Chungbuk Athletic High School |
—— | 9.000 | —— | —— | —— | —— | 9.000 |
| 53 | Park Dongjun Chungbuk Athletic High School |
—— | —— | —— | —— | 5.100 | 3.400 | 8.500 |
| 54 | Jeon Hyunsoo Chungnam Athletic High School |
—— | 6.950 | —— | —— | —— | —— | 6.950 |