| Competition: | K4 League |
| Season: | 2020 |
| Dates: | 16 May – 22 November 2020 |
| Winners: | Paju Citizen (1st title) |
| Promoted: | Paju Citizen Ulsan Citizen |
| Matches: | 157 |
| Total Goals: | 482 |
| Best Player: | Heo Keon[1] |
| League Topscorer: | Yoo Dong-gyu (15 goals) |
| Prevseason: | 2019 K3 Basic |
| Nextseason: | 2021 |
The 2020 K4 League is the first season of the K4 League. The K4 League was regarded as the successor to the K3 League Basic, which was abolished in 2019.
Five K3 League Advanced teams, six K3 League Basic teams and two newly-founded teams entered in the inaugural season.[2] The 13 participating teams played each other twice. The top two teams could be directly promoted to the relaunched K3 League, and the third and fourth-placed teams qualified for the promotion play-offs.[3]
| Club | City | Stadium | Capacity | |
|---|---|---|---|---|
| Chungju Citizen | Chungju | Chungju Tangeum Stadium | 3,000 | |
| Goyang Citizen | Goyang | Eoulimnuri Byeolmuri Ground | 2,500 | |
| Icheon Citizen | Icheon | Icheon City Stadium | 20,305 | |
| Jinju Citizen | Jinju | Jinju Stadium | 20,116 | |
| FC Namdong | Incheon | Namdong Industrial Complex Park | 2,500 | |
| Paju Citizen | Paju | Paju Public Stadium | 23,000 | |
| Pocheon Citizen | Pocheon | Pocheon Stadium | 7,000 | |
| Seoul Jungnang | Seoul | Jungnang Public Ground | ||
| Seoul Nowon United | Seoul | Nowon Madeul Stadium | 446 | |
| Siheung Citizen | Siheung | Jeongwang Sports Park | 1,500 | |
| Ulsan Citizen | Ulsan | Ulsan Stadium | 19,471 | |
| Yangpyeong FC | Yangpyeong | Yongmun Sports Park | ||
| Yeoju Citizen | Yeoju | Yeoju Stadium | 16,000 |
| Club | Manager | |
|---|---|---|
| Chungju Citizen |  Gong Mun-bae | |
| Goyang Citizen | Kim Young-ho | |
| Icheon Citizen | Lee Cheon-hong | |
| Jinju Citizen | Choi Cheong-il | |
| FC Namdong | Kim Jeong-jae | |
| Paju Citizen | Oh Won-jae | |
| Pocheon Citizen | Cho Man-geun | |
| Seoul Jungnang | Kim Sang-hwa | |
| Seoul Nowon United | Lee Jeong-jae | |
| Siheung Citizen | Jeong Seon-woo | |
| Ulsan Citizen | Jung Jin-hyuk | |
| Yangpyeong FC | Kim Chang-yoon | |
| Yeoju Citizen | Shim Bong-seop |
The first round of promotion play-offs was contested between the third and fourth-placed teams, and its winners played the 14th-placed team of K3 League in the final (K3 League relegation play-off). Pocheon Citizen withdrew from the play-offs and so Jinju Citizen advanced to the final.[4]
When the match was finished as a draw, both clubs remained in their respective leagues.