Khǒr Royal Cup was the second-highest level of the Thai football league system from 1916 to 1995.

The Khǒr Royal Cup was downgraded to the third-tier tournament in 1996, replaced by the Thai Division 1 League.

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.

Rangsit University Bank for agriculture and agricultural co-operatives 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.