2023–24 Thai League 3 National Championship

The National Championship was the next stage from the regional stage of 2023–24 Thai League 3.

The winners and runners-ups of each region[1][2] would qualify for this round to find 3 clubs promoting to 2024–25 Thai League 2.

Winners, runners-up, and third place of 2023–24 Thai League 3 would be promoted to the 2024–25 Thai League 2.

Mahasarakham SBT won 3–2 on aggregate.

Bangkok won 3–2 on aggregate.