2009 Thai Division 1 League
The 2009 Thai League Division 1 has 16 teams.
Rules
- Teams play each other twice on a home and away basis
- 3 Points for a win
- 1 Point for a draw
- Teams finishing on same points at the end of the season use head-to-head record to determine finishing position.
- The top three teams will be promoted to Premier League.
- The top team as champions.
- The bottom three teams will be relegated to Division 2.
Prize money
- Champion : 700,000 Baht
- Runner-up : 300,000 Baht
- Third Place : 200,000 Baht
- Fourth Place : 100,000 Baht
- Fifth Place : 50,000 Baht
- Sixth Place : 40,000 Baht
- Seventh Place : 20,000 Baht
Member clubs
Stadia and locations
| Club | Province | Home Stadium | Capacity | |
| Chanthaburi | Chanthaburi | Chanthaburi Province Stadium | 3,500 | |
| Khonkaen | Khon Kaen | Khon Kaen Province Stadium | ? | |
| Nakhon Sawan | Nakhon Sawan | Nakhon Sawan Sport School Stadium | Army Welfare Department Promoted from 2008 Thailand Division 2 League Nakhon Sawan Reprieve after Army Welfare Department withdrew | |
| Customs Department | Min Buri, Bangkok | Kasem Bundit University Stadium | 2,000 | Relegated from Thailand Premier League |
| Prachinburi | Prachinburi | Prachinburi Province Stadium | 3,196 | Promoted from 2008 Thailand Division 2 League |
| PTT | Chonburi | Chonburi Physical Education Institute Stadium | 12,000 | |
| Rattana Bundit | Bangkok | RBAC University Stadium | ? | |
| Royal Thai Air Force | Pathum Thani | Thupatemee Stadium | 20,000 | |
| Royal Thai Army | Bangkok | Thai Army Sports Stadium | 20,000 | Relegated from Thailand Premier League |
| Police United | Bangkok | Klong Chan Sports Center | ||
| Songkhla | Songkhla | Jiranakorn Stadium | 20,000 | Promoted from 2008 Thailand Division 2 League |
| Sisaket | Sisaket | Sri Nakhon Lamduan Stadium | 9,773 | Promoted from Thailand Division 2 League |
| Suphanburi | Suphanburi | Suphanburi Municipality Stadium | 25,000 | |
| Surat Thani | Surat Thani | Surat Thani Province Stadium | 10,000 | |
| Thai Airways-Ban Bueng | Chonburi | Beer Chang Stadium | 3,518 | |
| Thai Honda | Bangkok | 72-years Anniversary Stadium | 5,000 | Won Pre Season Playoff |
- Bangkok Bank FC 1
Pre Season Playoff
The winners of the Pre Season Playoff would fill the void left by Bangkok Bank FC, after they withdrew from the league after being relegated from the Thailand Premier League.The four semi finalist's in the play-offs, are the four relegated clubs from the 2008 season of the Thailand Division 1 League.
Play-offs
Bracket
Semi finals
--------
Final
----Final league table
Results
Top scorers
Last updated October 17, 2009| Scorer | Goals | Team |
 Wutthipong Kerdkul | 27 | Rattana Bundit |
| Manit Noywech | 24 | Police United |
| Jirawut Saranan | 20 | PTT |
| Sirasak Musbun-gor | 17 | Chanthaburi |
| Tatree Seeha | 17 | Royal Thai Army |
| Piroj Anantanarong | 16 | Sisaket |
| Arnon Buspha | 13 | Nakhon Sawan |
| Choklap Nilsaeng | 12 | Customs Department |
| Eakarthit Somjit | 12 | Police United |
| Sarawut Vichien | 12 | Khonkaen |
| Phuritad Jarikanon | 11 | Thai Airways-Ban Bueng |
| Rermrat Ngamchareon | 11 | Khonkaen |
| Witthawat Iamram | 11 | Songkhla |
| Mongkol Tossakrai | 10 | Royal Thai Army |
| Jakkrapong Somboon | 9 | Royal Thai Army |
| Sutin Anukoon | 9 | Thai Honda |
| Charin Bood-Hard | 8 | Khonkaen |