Template:2021 K3 League table

Pos	Team	Pld	W	D	L	GF	GA	GD	Pts	Qualification or relegation
1	Cheonan City	28	16	6	6	50	25	+25	54	Qualification for Championship final
2	Gimpo FC (C, P)	28	14	10	4	35	20	+15	52	Qualification for Championship semi-final and K League 2
3	Mokpo City	28	14	8	6	34	23	+11	50	Qualification for Championship first round
4	Gyeongju KHNP	28	13	7	8	39	30	+9	46	Qualification for Championship first round
5	Gimhae FC	28	12	8	8	39	35	+4	44
6	Busan Transportation Corporation	28	11	8	9	32	33	−1	41
7	Ulsan Citizen	28	9	11	8	32	24	+8	38
8	Changwon City	28	9	11	8	28	27	+1	38
9	Daejeon Korail	28	8	12	8	32	30	+2	36
10	Paju Citizen	28	8	11	9	32	36	−4	35
11	Cheongju FC	28	9	7	12	37	39	−2	34
12	Hwaseong FC	28	8	10	10	29	34	−5	34
13	Gangneung City	28	4	8	16	23	42	−19	20
14	Yangju Citizen	28	4	8	16	17	43	−26	20
15	Pyeongtaek Citizen (R)	28	5	7	16	20	38	−18	2	Relegation to K4 League

Source: Soccerway Flashscore
Rules for classification: 1) Points; 2) Goal difference; 3) Goals scored; 4) Wins
(C) Champions; (P) Promoted; (R) Relegated