2003–04 Thai League

The 2003–04 Thai Premier League had 10 teams. Two clubs would be relegated and 2 teams promoted 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 (promoted from Division 1)
 * BEC Tero Sasana
 * Sinthana
 * Krung Thai Bank
 * Osotsapa M-150
 * Port Authority of Thailand
 * Royal Thai Air Force
 * Royal Thai Navy (promoted from Division 1)
 * Thailand Tobacco Monopoly

Queen's Cup
Osotsapa FC again won the Queen's Cup. This was their third success in a row.

Asian Representation

 * Again in another revamped and expanded Asian Champions League, last years runners up BEC Tero Sasana met their match and came bottom of a tough group comprising sides from China, South Korea and Japan. Krung Thai Bank also entered this year and came in second place in their group, although still not good enough to qualify for the knockout stages.

Coach of the Year

 * 🇹🇭 Worrawoot Dangsamer - Krung Thai Bank

Player of the year

 * 🇹🇭 Pichitphong Choeichiu - Krung Thai Bank

Top scorer

 * 🇹🇭 Vimol Jankam - 14 Goals Osotsapa M 150

Champions
The league champion was Krung Thai Bank. It was the second time the team won the title.