| Competition: | K3 League Advanced |
| Season: | 2018 |
| Dates: | 24 March – 24 November 2018 |
| Winners: | Gyeongju Citizen (3rd title) |
| Best Player: | Choi Yong-woo[1] |
| League Topscorer: | Choi Yong-woo (16 goals) |
| Best Goalkeeper: | Jeong Gyu-jin |
| Matches: | 132 |
| Total Goals: | 404 |
| Biggest Home Win: | Pocheon 7–0 Jungnang |
| Biggest Away Win: | Jungnang 0–9 Hwaseong |
| Highest Attendance: | 1655 |
| Lowest Attendance: | 75 |
| Average Attendance: | 262 |
| Relegated: | Jeonju Citizen Seoul Jungnang |
| Prevseason: | 2017 |
| Nextseason: | 2019 |
The 2018 K3 League Advanced was the twelfth season of amateur K3 League.
| Club | City | Stadium | Capacity | Manager | |
|---|---|---|---|---|---|
| Cheongju City | Cheongju | Cheongju Stadium | 17,264 |  Kwon Oh-gyu | |
| Chungbuk Cheongju | Cheongju | Cheongju Stadium | 17,264 | Park Yang-hoon | |
| Chuncheon FC | Chuncheon | Chuncheon Stadium | 20,000 | Kim Yong-ho | |
| Gimpo Citizen | Gimpo | Gimpo Sports Complex | 5,068 | Oh Jong-yeo | |
| Gyeongju Citizen | Gyeongju | Gyeongju Civic Stadium | 12,199 | Kim Dae-geon | |
| Hwaseong FC | Hwaseong | Hwaseong Stadium | 35,270 | Kim Seong-nam | |
| Icheon Citizen | Icheon | Icheon Stadium | 20,305 | Lee Yeong-gi | |
| Jeonju Citizen | Jeonju | 30,000 | Yang Young-cheol | ||
| Seoul Jungnang | Seoul | Jungnang Public Ground | 400 | Kim Sang-hwa | |
| Pocheon Citizen | Pocheon | Pocheon Stadium | 7,000 | Kim Jae-hyeong | |
| Pyeongtaek Citizen | Pyeongtaek | Sosabeol Reports Town | 15,000 | Lee Seong-gyun | |
| Yangpyeong FC | Yangpyeong | Yongmun Sports Park | 400 | Kim Gyeong-bum |
When the first round and semi-final matches were finished as draws, their winners were decided on the regular season rankings without extra time and the penalty shoot-out.