| Season | 2019 |
|---|---|
| Dates | 22 February – 26 October 2019 |
| Champions | Chiangrai United |
| Relegated | Chainat Hornbill Chiangmai |
| AFC Champions League | Chiangrai United Buriram United Port |
| ASEAN Club Championship | Chiangrai United Prachuap |
| Matches played | 240 |
| Goals scored | 648 (2.7 per match) |
| Top goalscorer | Lonsana Doumbouya (20 goals) |
| Biggest home win | 6 goals difference Buriram United 6–0 Ratchaburi Mitr Phol (17 August 2019) |
| Biggest away win | 3 goals difference Muangthong United 0–3 Samut Prakan City (11 May 2019) Samut Prakan City 0–3 PTT Rayong (13 July 2019) Samut Prakan City 0–3 Chiangrai United (11 August 2019) |
| Highest scoring | 12 goals scored Chonburi 7–5 Chiangmai (21 April 2019) *all-time league record |
| Longest winning run | 5 matches Port |
| Longest unbeaten run | 11 matches Chiangrai United |
| Longest winless run | 8 matches Muangthong United |
| Longest losing run | 4 matches Chiangmai Muangthong United Samut Prakan City Trat |
| Highest attendance | 32,538 Buriram United 3–1 Port (20 October 2019) |
| Lowest attendance | 443 Chiangmai 1–3 Trat (18 August 2019) |
| Total attendance | 1,367,681 |
| Average attendance | 5,699 |
← 2018 2020–21 → | |
The 2019 Thai League 1 is the 23rd season of the Thai League 1, the top Thai professional league for association football clubs, since its establishment in 1996, also known as Toyota Thai League due to the sponsorship deal with Toyota Motor Thailand. A total of 16 teams will compete in the league. The season began on 22 February 2019 and is scheduled to conclude on 27 October 2019.[1]
Buriram United are the defending champions, while PTT Rayong, Trat and Chiangmai have entered as the promoted teams from the 2018 Thai League 2.
The 1st transfer window is from 26 November 2018 to 19 February 2019 while the 2nd transfer window is from 24 June 2019 to 19 July 2019.
Chiangrai United won the league for the first time in history, this is the first time since 2007 that neither Muangthong United nor Buriram United were not crowned champions.