The 2023 Thailand Semi-pro League is the first season of the Thailand Semi-pro League, the fourth-tier professional league for association football clubs in Thailand, since its establishment in 2023,[3] also known as PTT Lubricants Semi-pro League due to the sponsorship deal with PTT Lubricants.

1st place of each zone and 1st place of Southern region of Thailand Amateur League qualified for this stage by being featured in 2 groups.

Teams from the Northern, Northeastern, and Eastern regions would have qualified for the upper group.

Meanwhile, teams from the Western and Bangkok Metropolitan regions and Southern region of Thailand Amateur League would have qualified for the lower group.

Assistant referees: Ritthiphong Phimpapan Phattarapon Racha Fourth official: Trin Sahachaipat Match Commissioner: Prakit Yenvorn Referee Assessor: Surin Khakhao General Coordinator: Jakkrit Chaiyaroek