The 2016 Football Division 3 is the 1st season of the League competition since its establishment in 2016. It is in the fourth tier of the Thai football league system.
Group stage: A total 13 clubs will be divided into four groups of three clubs except group 4 which has four clubs to play round-robin matches at a neutral venue. The best two clubs of each group will qualify to the knock-out stage.
Knock-out stage: A total of 8 clubs which has qualified from the group stage will play single-elimination stage until there are only two finalists of the tournament.
Group stage: A total 10 clubs will be divided into four groups of three clubs except group 3 which has four clubs to play round-robin matches at a neutral venue. The best two clubs of group A and B, The best three clubs of group C and The best points of 3rd position in group A and B will qualify to the knock-out stage.
Knock-out stage: A total of 8 clubs which has qualified from the group stage will play single-elimination stage until there are only two finalists of the tournament.
Group stage: A total 21 clubs will be divided into four groups of three clubs except group 7 which has four clubs to play round-robin matches at a neutral venue. The best clubs of group A and G qualify to Quarter-finals round of the knock-out stage. The best two clubs of group B, C, D, E, F and runner-up of group A and G will qualify to Second round of the knock-out stage.
Knock-out stage: A total of 14 clubs which has qualified from the group stage will play single-elimination stage until there are only two finalists of the tournament.
Group stage: A total 54 clubs will be divided into four groups of three clubs except group 18 which has four clubs to play round-robin matches at a neutral venue. The best clubs of group A and G qualify to Quarter-finals round of the knock-out stage. The best clubs of group B, C, E, F, G and H, The best two clubs of group A, D, I, J, K, L, M, N, O, P, Q and R will qualify to third round of the knock-out stage. Runner-up of group E, F, G and H will qualify to second round of the knock-out stage.
Knock-out stage: A total of 18 clubs which has qualified from the group stage will play single-elimination stage until there are only two finalists of the tournament.
All matches played in Wiang Sa District, Surat Thani
All four teams played a one-legged round-robin match. The best two teams advanced to the final round, and the winner of the final round was promoted to 2017 Thai Division 2 League.