The 2015 Thai Premier League (also known as Toyota Thai Premier League due to the sponsorship from Toyota) was the 19th season of the Thai Premier League since its establishment in 1996. A total of 18 teams competed in the league. The season began on 14 February and finished on 13 December.
Buriram United were the defending champions, having won their Thai Premier League title the previous season. Nakhon Ratchasima, Saraburi and Navy entered as the three promoted teams.
A total of 18 teams contested the league, including 15 sides from the 2014 season and three promoted from the 2014 Thai Division 1 League.
Police United, PTT Rayong, Songkhla United, Air Force Central and GSE Samut Songkhram were relegated to the 2015 Thai Division 1 League after finishing the 2014 season. They were replaced by the best three teams from the 2014 Thai Division 1 League champions Nakhon Ratchasima, runners-up Saraburi and third place Navy.
<small>Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.</small>
The number of foreign players is restricted to five per TPL team. A team can use four foreign players on the field in each game, including at least one player from the AFC country.
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The Player of the Year was awarded to Diogo (Buriram United).
The Coach of the Year was awarded to Alexandre Gama (Buriram United).
The Golden Boot of the Year was awarded to Diogo (Buriram United).
The Fair Play of the Year was awarded to Army United.