2023 K3 League

The 2023 K3 League was the third season of the K3 League as a semi-professional league. Its regular season was held from 11 March to 11 November 2023.

The 15 participating teams played each other twice. The 14th-placed team advanced to the relegation play-off and the bottom team was directly relegated to the K4 League.

Team changes
Promoted from K4 League
 * Yangpyeong FC
 * Chuncheon Citizen

Promoted to K League 2
 * Cheonan City
 * Cheongju FC (renamed Chungbuk Cheongju)

Relegated to K4 League
 * Dangjin Citizen

Foreign players
Restricting the number of foreign players strictly to four per team, including a slot for a player from the AFC countries. A team could use four foreign players on the field each game, including at least one player from the AFC.

The name in bold indicates that the player was registered during the mid-season transfer window.

Relegation play-off
The relegation play-off (K4 League promotion play-offs final) was contested between the 14th-placed team of K3 League and the winners of K4 League play-off (semi-final).