|Full name||Rangsan Viwatchaichok|
|Date of birth||January 22, 1979|
|Place of birth||Bangkok, Thailand|
|Height||1.78 m (5 ft 10 in)|
|1995–1997||Stock Exchange of Thailand|
|1999–2001||BEC Tero Sasana||45||(4)|
|2002||Krung Thai Bank||8||(1)|
|2004||Krung Thai Bank||16||(0)|
|2012–2016||BEC Tero Sasana||112||(16)|
|2013||BEC Tero Sasana (Assistant Coach)|
|2015||BEC Tero Sasana (Caretaker)|
|2017–||Suphanburi (Assistant Coach)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 22 June 2016.
‡ National team caps and goals correct as of 29 February 2012
Rangsan Viwatchaichok (Thai: รังสรรค์ วิวัฒน์ชัยโชค; rtgs: Rangsan Wiwatchaichok), born January 22, 1979), simply known as Aon (Thai: อ้น; rtgs: On) is a Thai retired professional footballer who plays as a Midfielder. He previously played for four other club teams in Thailand and Singapore. Rangsan is known for his set pieces.
He had coached the club for three games before the appoitnment of Manuel Cajuda on 27 August.
On 1 December 2015, He was promoted to be the interim manager again after the resignation of Manuel Cajuda. Rangsan managed the club in the last three games of 2015 season with the record of 2 wins and 1 loss. The club set to relegate to Division 1 according to the final standing but still remained in top league after the withdraw of Saraburi F.C. from the competetion.
|—||18 July 2009||Nonthaburi, Thailand||Pakistan||4-0||Won||Unofficial friendly|
- As of 13 December 2015
|BEC Tero Sasana (caretaker)||9 August 2015||27 August 2015||3||0||1||2||4||6||−2||0.00|
|BEC Tero Sasana (caretaker)||1 December 2015||13 December 2015||3||2||1||0||8||2||+6||66.67|
Note: win by penalty shoot-out is counted as the draw in time.
- BEC Tero Sasana
- Krung Thai Bank
- Buriram United
- "Rangsan Viwatchaichok". Soccerway. Retrieved 14 February 2016.
- "Rangsan Viwatchaichok". National Football Teams. Retrieved 14 February 2016.
- เทโรฯสั่งปลดเรเน่แล้วดันโชคทวีคุมแทน Siamsport. Retrieved 11 July 2013
- BREAKING ! มังกรไฟแขวนชิลส์ตั้งกัปตันอ้นคุมดวลท่าเรือ Goal. Retrieved 9 August 2015
- บีอีซี เทโรศาสน ตั้ง "รังสรรค์" คุมทีม 3 นัดหนีตกชั้นแทน "คาจูดา" Thaipbs. Retrieved 2 December 2015
- Rangsan Viwatchaichok at soccerway.com