The 2021 K4 League is the second season of the K4 League.
The R League teams (reserve teams of K League teams) could not have been involved in the South Korean football league system originally, but were allowed to join the K4 League since this season. They had to use seven or more under-23 players in the starting line-up. Gangwon FC became the first club to enter the K4 League with reserve team.
Defending champions Paju Citizen were promoted to the K3 League alongside runners-up Ulsan Citizen, and Chuncheon Citizen and Jeonju Citizen played in the K4 League for the first time by being relegated from the K3 League. Icheon Citizen was disbanded due to financial problems, while four newly-founded teams Dangjin Citizen, Geoje Citizen, Pyeongchang United (successor to K3 League Basic team Pyeongchang FC) and Gangwon FC B joined the league.
The 16 participating teams played each other twice. The top two teams were directly promoted to the K3 League, and the third and fourth-placed teams qualified for the promotion play-off.
Teams
Team changes
Relegated from K3 League
- Chuncheon Citizen
- Jeonju Citizen
Newly joined
- Dangjin Citizen
- Gangwon FC B
- Geoje Citizen
- Pyeongchang United
Promoted to K3 League
- Paju Citizen
- Ulsan Citizen
Withdrawn
- Icheon Citizen
Stadiums and locations
Personnel
League table
Results
Promotion play-off
When the match was finished as a draw, its winners were decided on the regular season rankings without extra time and penalty shoot-out.
See also
- 2021 in South Korean football
- 2021 Korean FA Cup
References
External links
![[K4리그 K4 League] 고양시민축구단 vs 서울중랑축구단 1R H/L YouTube](https://i.ytimg.com/vi/0XSbXlcjXsk/maxresdefault.jpg)
![[K4리그 l K4 League] 2020 K4리그 1R 포천시민축구단 vs 서울노원유나이티드 YouTube](https://i.ytimg.com/vi/qzeBYlhNyTQ/maxresdefault.jpg)

![[K4 League] 세종바네스축구단 vs 서울노원유나이티드 18R FULL MATCH YouTube](https://i.ytimg.com/vi/gelMngWxyQU/maxresdefault_live.jpg)
![[K4리그 l K4 League] 2020 K4리그 6R 서울노원유나이티드 vs 고양시민축구단 YouTube](https://i.ytimg.com/vi/_w8zIpG1B3M/maxresdefault.jpg)