|Relegated||UCOM Raj Pracha|
|1999–2000 Asian Club Championship||Sinthana|
|1999–2000 Asian Cup Winners Cup||Bangkok Bank FC|
|Top goalscorer|| Ronnachai Sayomchai |
(Port Authority of Thailand) (23)
The 1998 Thai Premier League consisted of 12 teams. The bottom club would be relegated to the Thailand Division 1 League. The club that came 11th would play in a relegation / promotion match against the club that came second in the Thailand Division 1 League
The league was also known as the Caltex Premier League.
Member clubs locations
- Bangkok Bank
- BEC Tero Sasana (Tero Sasana)
- Krung Thai Bank (promoted from Division 1)
- Osotsapa M-150 (promoted from Division 1)
- Port Authority of Thailand
- UCOM Raj Pracha
- Bangkok Metropolitan Administration
- Royal Thai Air Force
- Royal Thai Army
- Thai Farmers Bank
Final league table
|Pos||Team||Pld||W||D||L||GF||GA||GD||Pts||Qualification or relegation|
|1||Sinthana||22||13||3||6||37||28||+9||42||Champion and Qualification for the 1999–2000 Asian Club Championship|
|2||Royal Thai Air Force[a]||22||10||10||2||52||31||+21||40|
|3||BEC Tero Sasana||22||10||8||4||47||23||+24||38|
|7||Royal Thai Army||22||7||5||10||35||42||−7||26|
|8||Thai Farmers Bank||22||5||10||7||33||37||−4||25|
|9||Krung Thai Bank[b]||22||6||4||12||24||37||−13||22|
|11||Bangkok Metropolitan||22||4||8||10||30||37||−7||20||Qualification for the promotion/relegation playoff|
|12||UCOM Raj Pracha||22||4||7||11||28||50||−22||19||Relegation spot|
Rules for classification: 1st points; 2nd head-to-head; 3rd goal difference; 4th goals scored
- Defending champion
- Promoted from last season
Promotion and relegation Playoff
The club that came 11th would play in a relegation / promotion match against the runner-up in the Thailand Division 1 League.
January 24 and January 31, 1998
|Team 1||Result||Team 2|
|† Bangkok Metropolitan Administration||3-1||Assumption Sriracha|
- The bottom club would be relegated, with the team coming 11th, to play in a relegation / promotion matchup against the 2nd placed team in Thailand Division 1 League.
- UCOM Raj Pracha were relegated and replaced by 2nd level winners Bangkok Bank of Commerce.
- Bangkok Metropolitan Administration overcame Assumption Sriracha in the playoff match.
- Tero Sasana changed the club's name again to BEC Tero Sasana with the main sponsor, Thailand’s Entertainment giant "BEC Tero Entertainment."
The Singha sponsored Queen's Cup was postponed because of lack of sponsorship, will be held next year but with reduced prize money.
Thailand FA Cup
Yamaha Thailand Cup
1998 saw the 14th edition of the Yamaha Thailand Cup.
It was Thailand's main inter-provincial competition, played between qualifiers from various regions.
The first round saw four groups of four teams, of which the top two sides qualified for the Quarter-Final knockout stage.
- BEC Tero Sasana represented Thailand in the 1998–99 Asian Club Championship, where they would reach the second round, beaten by Chinese opposition in Dalian Wanda, the same club who ended Bangkok Bank's adventure the previous year.
- Sinthana made the second round of the 1998–99 Asian Cup Winners Cup, where they were out classed by Japanese opposition in Kashima Antlers.
Coach of the Year
Player of the Year
The champion for the 1998 season was Sinthana. It was the team's first title.
- Thailand 1998 RSSSF
Thailand Soccer League
| Thai Premier League
Thai Premier League