| Competition: | K4 League |
| Season: | 2023 |
| Dates: | 25 February – 11 November 2023[1] |
| Winners: | Yeoju FC (1st title) |
| Promoted: | Yeoju FC Daegu FC B |
| Best Player: | Jeong Chung-geun[2] |
| League Topscorer: | Jeong Chung-geun (17 goals) |
| Prevseason: | 2022 |
| Nextseason: | 2024 |
The 2023 K4 League was the fourth season of the K4 League.
Defending champions Goyang KH was dissolved. Runners-up Yangpyeong FC and promotion play-offs winners Chuncheon Citizen were promoted to the K3 League, while Dangjin Citizen were relegated from the K3 League.
The 16 participating teams played each other twice. The top two teams were promoted to the K3 League and the third and foruth-placed teams qualified for the promotion play-offs.[3]
On 3 July 2023, Goyang Happiness were dissolved due to their financial crisis and Korea Football Association decided to nullify Goyang Happiness' results.
Relegated from K3 League
Newly joined
Promoted to K3 League
Withdrawn
| Club | City | Stadium | Capacity | |
|---|---|---|---|---|
| Busan IPark Futures | Busan | Busan Asiad Auxiliary Stadium | 4,549 | |
| FC Chungju | Chungju | Chungju Tangeum Stadium | 3,000 | |
| Daegu FC B | Daegu | Daegu Stadium Auxiliary Stadium | 66,422 | |
| Daejeon Hana Citizen B | Daejeon | Daejeon World Cup Stadium Auxiliary Stadium | ||
| Boeun | Boeun Stadium | |||
| Dangjin Citizen | Dangjin | Dangjin Sports Complex | 11,718 | |
| Gangwon FC B | Gangneung | Gangbuk Public Stadium | ||
| Gangnam Football Park | ||||
| Gangneung Olympic Park | ||||
| Wonju | Wonju Stadium | |||
| Donghae | Donghae Stadium | |||
| Geoje Citizen | Geoje | Geoje Stadium | 7,500 | |
| Jeonbuk Hyundai Motors B | Wanju | Wanju Stadium | ||
| Jeonju Citizen | Jeonju | Jeonju Stadium | 30,000 | |
| Jeonju University Artificial Turf Ground A | ||||
| Jinju Citizen | Jinju | Jinju Stadium | 20,116 | |
| Pyeongchang United | Pyeongchang | Jinbu Sports Park | 300 | |
| Pyeongtaek Citizen | Pyeongtaek | 15,000 | ||
| Sejong Vanesse | Sejong City | Sejong Civic Stadium Auxiliary Stadium | ||
| Seoul Jungnang | Seoul | Jungnang Public Ground | 400 | |
| Seoul Nowon United | Seoul | Nowon Madeul Stadium | 446 | |
| Yeoju FC | Yeoju | Yeoju Stadium | 16,000 |
| Club | Manager | |
|---|---|---|
| Busan IPark Futures |  Kim Chi-gon | |
| FC Chungju | Gong Moon-bae | |
| Daegu FC B | ||
| Daejeon Hana Citizen B | ||
| Dangjin Citizen | Han Sang-min | |
| Gangwon FC B | Lee Seul-gi | |
| Geoje Citizen | Song Jae-gyu | |
| Jeonbuk Hyundai Motors B | Park Jun-sub | |
| Jeonju Citizen | Yang Young-cheol | |
| Jinju Citizen | Choi Cheong-il | |
| Pyeongchang United | An Hong-min | |
| Pyeongtaek Citizen | Lee Ho-joon | |
| Sejong Vanesse | ||
| Seoul Jungnang | Kim Sang-hwa | |
| Seoul Nowon United | Lee Jeong-jae | |
| Yeoju FC | Shim Bong-seop |
The promotion play-offs final (K3 League relegation play-off) was contested between the 14th-placed team of K3 League and the winners of the first round.