2019 K3 League Basic

The 2019 K3 League Basic was the third and last season of the K3 League Basic. After the 2019 season, amateur K3 Leagues were relaunched as semi-professional leagues in the name of K3 League and K4 League.

Team changes
Relegated from K3 League Advanced
 * Jeonju Citizen
 * Seoul Jungnang

Promoted to K3 League Advanced
 * Chungju Citizen
 * Paju Citizen
 * Siheung Citizen

Withdrawn
 * Busan FC
 * Buyeo FC
 * FC Uijeongbu

Newly joined
 * Ulsan Citizen

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

Players name in bold indicates the player is registered during the mid-season transfer window.

Promotion playoffs
The promotion-relegation playoff was contested between winners of Basic league playoff (semi-final) and 10th-placed team of Advanced league, but the match became meaningless after Korea Football Association decided to examine every K3 League club for qualification for newly-founded K3 League or K4 League.