Teerasak Po-on (Thai: ธีระศักดิ์ โพธิ์อ้น; born 18 May 1978) is a Thai professional football manager and former player, who is the currently the manager of Thai League 1 club Nakhon Ratchasima.

Teerasak played for Thailand at the 1997 FIFA U-17 World Championship in Egypt.^[1]

In 2012, it was announced that Teerasak become player-manager of his first club Chiangrai United. In 2014, it was announced that Po-on would be the head coach at Chiangrai United for the next season, after retiring from professional football on the same day. He managed the team until 20 October 2016.

In 2016, Teerasak Po-on was appointed to be the head coach of PTT Rayong. He led the team in 2018 Thai League 2 and led the team back to Thai League 1 again.

On 5 February 2023, Teerasak returned to Nakhon Ratchasima, agreeing a two-year contract to replace outgoing manager Kevin Blackwell. His first game in charge was a Thai FA Cup match on 8 February 2023 against Suphanburi, ending with a 5–1 victory for Nakhon Ratchasima.

On 21 April 2023, a Thai League 2 match against Nongbua Pitchaya ending with a 3–0 victory for Nakhon Ratchasima. As a result, the team won the Thai League 2 championship in the 2023–24 season, even though the last match was left to play against Chanthaburi because Nakhon Ratchasima had a better Head To Head result than Nongbua Pitchaya and was considered the first champion in 10 years for the team. ^[2]

As of match played 9 March 2025

Managerial record by team and tenure

Team	Nat	From	To	Record
				G	W	D	L	Win %
Chiangrai United		23 November 2013	20 October 2016	120	49	31	40	040.83
PTT Rayong		2 November 2016	27 October 2019	102	45	22	35	044.12
Nakhon Ratchasima		27 October 2019	8 March 2022	60	22	16	22	036.67
PT Prachuap		15 June 2022	11 November 2022	14	4	2	8	028.57
Nakhon Ratchasima		5 February 2023	Present	78	34	24	20	043.59
Career Total				374	154	95	125	041.18

Krung Thai Bank

• Thai Premier League: 2003–04

Chonburi

• Thai Premier League: 2007
• Kor Royal Cup: 2008, 2009

Thailand

• AFC U-17 Championship runners-up: 1996

PTT Rayong

• Thai League 2: 2018

Nakhon Ratchasima

• Thai League 2: 2023–24

Individual

• Thai League 1 Coach of the Month: March 2016, March 2023
• Thai League 2 Coach of the Year: 2023–24

• Teerasak Po-on at Soccerway