| Competition: | K3 League |
| Season: | 2016 |
| Dates: | 19 March – 12 November 2016 |
| Winners: | FC Pocheon (5th title) |
| Best Player: | Jang Won-seok[1] |
| League Topscorer: | Kim Seong-min (17 goals) |
| Best Goalkeeper: | Choi An-seong |
| Matches: | 198 |
| Total Goals: | 636 |
| Prevseason: | 2015 |
| Nextseason: | 2017 |
The 2016 K3 League was the tenth season of amateur K3 League.
Before the start of the 2016 season, Seoul FC Martyrs withdrew from the league, but Buyeo FC, Siheung Citizen and Yangpyeong FC joined the league.
The top five teams of the regular season qualified for the championship playoffs, and winners of the regular season advanced to the final directly.
On the other hand, eight teams of participating teams had to be relegated to the K3 League Basic, founded as the second division of the K3 League in 2017. The bottom five teams of the regular season were directly relegated, and three losing teams were additionally relegated after the relegation playoffs, contested between four teams from 12th to 15th-placed team.
| Club | City | Stadium | Manager | |
|---|---|---|---|---|
| Buyeo FC | Buyeo | Buyeo Stadium |  Kang Jeong-hoon | |
| Cheongju City | Cheongju | Heungdeok Football Park | Seo Won-sang | |
| Chungbuk Cheongju | Cheongju | Cheongju Stadium | Kim Jong-hyun | |
| Chuncheon FC | Chuncheon | Chuncheon Stadium | Kim Yong-Ho | |
| Gimpo Citizen | Gimpo | Gimpo City Stadium | Yoo Jong-wan | |
| Goyang Citizen | Goyang | Goyang Eoulimnuri ground | Kim Jin-ok | |
| Gyeongju Citizen | Gyeongju | Gyeongju Civic Stadium | Kim Jin-hyung | |
| Hwaseong FC | Hwaseong | Hwaseong Stadium | Kim Jong-boo | |
| Icheon Citizen | Icheon | Icheon City Stadium | Lee Hyun-chang | |
| Jeonju FC | Jeonju | Jeonju University ground | Yang Young-cheol | |
| Jungnang Chorus Mustang | Seoul | Jungnang Public Ground | Yoo Bong-ki | |
| Paju Citizen | Paju | Paju Public Stadium | Oh Won-jae | |
| Pyeongchang FC | Pyeongchang | Pyeongchang Stadium | Hwang Young-woo | |
| FC Pocheon | Pocheon | Pocheon Stadium | In Chang-soo | |
| Siheung Citizen | Siheung | Siheung Stadium |  Kike Linero | |
| Seoul United | Seoul | Madeul Stadium | Kim Chang-kyum | |
| FC Uijeongbu | Uijeongbu | Uijeongbu Stadium | Kim Hee-tae | |
| Yangju Citizen | Yangju | Yangju Stadium | Lee Seung-hee | |
| Yangpyeong FC | Yangpyeong | Yangpyeong Stadium | Cha Seung-yong | |
| Yeonggwang FC | Yeonggwang | Yeonggwang Sportium | Kim Han-bong |
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.
----
----FC Pocheon won 4–2 on aggregate.