Nakhon Ratchasima, Nongbua Pitchaya and Lampang were relegated at the end of the 2022–23 season after finishing in the bottom three places of the table.
The three were replaced by 2022-23 Thai League 2 champions Nakhon Pathom United, who are returning to the top-flight after a 14-year exile that saw them participating in the lowest tier of Thai professional football in the 2018 season.
They were joined by runners-up Trat, who are returning to the top-flight after 2 years away and Uthai Thani, the promotion playoff winner which was first held in 2020–21 season.
Note: Flags indicate national team as has been defined under FIFA eligibility rules.
Notes: The table lists the positions of teams after each week of matches.