2004–05 Thai League

The 2004-05 Thai Premier League had 10 teams. Two clubs would be relegated as the league would be expanded to 12 teams for the 2006 season. Two teams promoted from the rival Provincial League and two clubs from Thailand Division 1 League. The team that finished in 8th position would play in a relegation play-off.

Member clubs

 * Bangkok Bank
 * Bangkok University
 * BEC Tero Sasana
 * Krung Thai Bank
 * Osotsapa M-150
 * Port Authority of Thailand
 * Provincial Electricity Authority (promoted from Division 1)
 * Royal Thai Navy
 * Thailand Tobacco Monopoly
 * TOT (promoted from Division 1)

Kings Trophy
The King's Trophy was an end of season match between the two clubs that finished first and second in the final Premier League standings.

Thailand Tobacco Monopoly, who won the Premier League, beat league runners up Provincial Electricity Authority 4-1.

Queens Cup
The Queen's Cup was postponed because of lack of sponsorship, will be held next year but with reduced prize money.

Asian Representation

 * In the 2005 Asian Champions League, a competition described as ''competition restricted to 14 countries considered 'mature' in the so-called 'Vision Asia' paper of AFC President Mohamed Bin Hammam. The so-called 14 'developing' countries have their clubs relegated to the AFC Cup, while the clubs from the 'emerging' countries are dumped into the new Presidents Cup.
 * BEC Tero Sasana and Krung Thai Bank would again be the Thai representatives and would also fail to qualify for the knockout stages. Krung Thai once again came in second place in their group, but a full 9 points behind group winners Busan I'Park. BEC would once again slump to bottom position on 1 point.
 * Thailand Tobacco Monopoly took part in the 2nd edition of ASEAN Club Championship this season but failed to make it out of the group stage, drawing one game and losing the other two games.

Coach of the Year

 * 🇧🇷 Jose Alves Borges - Thailand Tobacco Monopoly

Player of the year

 * 🇧🇷 José Carlos Da Silva - Thailand Tobacco Monopoly

Top scorer

 * 🇹🇭 Supakit Jinajai - 10 Goals Provincial Electricity Authority
 * 🇹🇭 Sarayoot Chaikamdee - 10 Goals Port Authority of Thailand