The 2025–26 Thai League 1 was the 9th season of Thai League 1 under its current name and the 29th season of top-flight Thai football professional league since its establishment in 1996. This league is also known as BYD Sealion 6 League I due to the sponsorship deal with BYD Auto. The season began on 15 August 2025 and concluded on 10 May 2026.
Buriram United entered the season as the four-time defending champions, having won their fourth consecutive league title and 11th overall Thai top-flight football title the previous season.
Overview Promotion and relegation (pre-season) 16 teams will compete in the league – the thirteen teams from previous season and three teams promoted from Thai League 2.
Teams promoted from Thai League 2 Chonburi and Ayutthaya United became the first two teams to be promoted on 26 April 2025 after winning their respective matches. Chonburi were also crowned champions by defeating Suphanburi 0–1 in an away match, while Ayutthaya United beat Bangkok 5–1. Kanchanaburi Power became the last team to be promoted after their win against Phrae United 4–5 on aggregate in promotion play-off match.
Chonburi returned to the top division after a one-season absence, while for Ayutthaya United and Kanchanaburi Power this was their first season in the top division in their history, respectively.
Teams relegated to Thai League 2 Khonkaen United became the first team to be relegated on 30 March 2025 after suffering a 0–5 defeat to Bangkok United. The result ended their time in the top division for 4 seasons.
Nakhon Pathom United became the second team to be relegated on 13 April 2025 after earning a 2–2 draw against Port. The result ended their time in the top division for 2 seasons.
Nongbua Pitchaya became the third and final team to be relegated after suffering a 1–2 defeat to Port and Rayong's win over Khonkaen United on 20 April 2025. These results meant that Nongbua Pitchaya only lasted one season in the top division and returned to the second division.
Teams Changes The following teams have changed division since the 2024–25 season.
To Thai League 1 Promoted from the Thai League 2 Chonburi Ayutthaya United Kanchanaburi Power
From Thai League 1 Relegated to the Thai League 2 Khonkaen United Nakhon Pathom United Nongbua Pitchaya
Teams by province Rank ProvinceNumber Teams1 Pathum Thani2Bangkok United and BG Pathum United2 Bangkok1PortBuriramBuriram United Chiang RaiChiangrai United ChonburiChonburi KanchanaburiKanchanaburi Power LamphunLamphun WarriorsNakhon RatchasimaNakhon Ratchasima NonthaburiMuangthong United Phra Nakhon Si AyutthayaAyutthaya United Prachuap Khiri KhanPT Prachuap RatchaburiRatchaburi RayongRayong SukhothaiSukhothai Uthai ThaniUthai Thani
Special administrative area.
Stadiums and locations
Team Location Stadium Capacity 2024–25 season ↑ 5,000 Thai League 2 Runner-up 15,114 15,114 32,600 12,000 11th in Thai League 1 ↑ 8,680 Thai League 2 Champion ↑ 13,000 Promotion play-off winner 5,179 9th in Thai League 1 13,000 25,000 13th in Thai League 1 6,250 5,000 10,000 7,500 12th in Thai League 1 8,020 10th in Thai League 1 5,500 8th in Thai League 1
↑ Promoted from the Thai League 2
Personnel and kits Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players and coaches may hold more than one non-FIFA nationality. TeamManagerCaptain Kit manufacturerKit sponsor Domestic Continental Other kit sponsor(s) Kitphom Bunsan Ego Sport Chang Everton Adidas True CP Sarach Yooyen Nike Leo Singha Group Narubadin Weerawatnodom Made by club Ego Sport Chang Sanukran Thinjom Grand Sport Singha Lemon Soda Channarong Promsrikaew FBT Chang Andros Townsend Imane Rabbit Akarapong Pumwisat Made by club Chang Tristan Do Ego Sport Yamaha Nattawut Jaroenboot Volt Mazda Peeradol Chamrasamee Mizuno Muang Thai Insurance Jirapan Phasukihan Ari PTG Energy Jakkaphan Kaewprom Ego Sport Chang Stenio Junior Made by club WHA Group Tassanapong Muaddarak Warrix Chang Wattana Playnum Warrix GRC
Interim. Apparel made by club. Apparel used on other competition. Kanchanaburi Power used Warrix as their apparel in the first half of the season. Rayong used Imane as their apparel in the first half of the season.
Managerial changes Pre-season Team Outgoing manager Date of vacancy Replaced by Date of appointment Lamphun Warriors Alexandre Gama Resigned 27 April 2025 Wanderley Junior 12 June 2025 Singha Chiangrai United Worawut Wangsawad End of interim spell 15 April 2025 Sirisak Yodyardthai 22 August 2025 Nakhon Ratchasima Teerasak Po-on Signed by Chonburi 29 April 2025 Issara Sritaro 30 May 2025 Uthai Thani Miloš JoksićEnd of contract 2 May 2025 Gino Lettieri 26 May 2025 Chonburi Thawatchai Damrong-Ongtrakul 4 May 2025 Teerasak Po-on 9 May 2025 Port Choketawee Promrut End of interim spell 7 May 2025 Alexandre Gama 1 June 2025 Muangthong United Gino Lettieri Signed by Uthai Thani 25 May 2025 Rangsan Viwatchaichok 28 May 2025
During the season Team Outgoing manager Date of vacancy Position in table Replaced by Date of appointment Kanchanaburi Power Dusit Chalermsan Sacked 25 September 2025 14th Joaquín Gómez 4 October 2025 BG Pathum United Supachai Komsilp 2 October 2025 4th Vladimir Vujović (interim) 2 October 2025 Buriram United Osmar Loss 7 October 2025 1st Mark Jackson 15 October 2025 Uthai Thani Gino Lettieri 8 October 2025 16th Miloš Joksić 8 October 2025 Lamphun Warriors Wanderley Junior 18 October 2025 14th Jongsarit Wutchuay 18 October 2025 Chonburi Teerasak Po-on 19 October 2025 15th Witthaya Laohakul (interim) 20 October 2025 Muangthong United Rangsan Viwatchaichok 25 October 2025 9th Uthai Boonmoh (interim) 26 October 2025 BG Pathum United Vladimir Vujović (interim)End of interim spell 25 October 2025 5th Masatada Ishii 30 October 2025 Chonburi Witthaya Laohakul (interim) 9 November 2025 10th Rangsan Viwatchaichok 12 November 2025 Kanchanaburi Power Joaquín GómezSacked 27 November 2025 14th Wasapol Kaewpaluk 27 November 2025 Nakhon Ratchasima Issara Sritaro 29 November 2025 16th Surapong Kongthep 1 December 2025 Lamphun Warriors Jongsarit Wutchuay (interim)End of interim spell 15 December 2025 14th Dennis Amato 15 December 2025 Muangthong United Uthai Boonmoh (interim) 29 December 2025 13th Mario Ivanković 29 December 2025 Sukhothai Aktaporn ChalitapornSacked 29 January 2026 11th Rattee Ueathanaphaisarn (Interim) 29 January 2026 BG Pathum United Masatada Ishii 6 February 2026 5th Vladimir Vujović 6 February 2026 Muangthong United Mario Ivanković Resigned 28 February 2026 15th Jose Alves Borges 28 February 2026 Sukothai Rattee Ueathanaphaisarn (Interim) End of interim spell 1 March 2026 12th Ekalak Thong-am 1 March 2026 Kanchanaburi Power Wasapol Kaewpaluk Resigned 6 April 2026 14th Lee Jung-soo 9 April 2026 Rayong Jukkapant Punpee Signed by U20 6 May 2026 9th
Foreign players Each team can register a maximum of seven foreign players and an unlimited number of players from the AFF member countries. However, only five foreign players and two AFF players are allowed in the line-up for each match.
Players named in bold indicates the player was registered during the mid-season transfer window. Former players named in italics are players that were out of squad or left the club within the season, after the pre-season transfer window, or in the mid-season transfer window, and at least had one appearance. Unregistered players refer to players who are not registered for the Thai League but still contracted to the team for other competitions. Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.