Khǒr Royal Cup

Each season or edition of the tournament was populated by clubs from its previous season which were neither promoted nor relegated, joined by the best four clubs promoted from the previous season of Khor Royal Cup. The first round was a group stage, with clubs divided into groups of 3 or 4 clubs. The winners and the runners-up of each group qualified to the knock-out stage. The finalists of the tournament were promoted to Regional League Division 2 for the following season, while the clubs which withdrew themselves from the tournament were relegated to Khor Royal Cup and Ngor Royal Cup for the following season.

Note

1: Both semi-finalists, Air Technical Training School and Pak Chong Sport School, were disqualified due to sending illegal players to the field; the final match of the 2015 Khǒr Royal Cup wasn't held, and Institute of Physical Education Samut Sakhon Campus automatically won the tournament, while Sena municipality qualified as the runner-up.