Thawatchai Damrong-Ongtrakul (Thai: ธวัชชัย ดำรงค์อ่องตระกูล; RTGS: Thawatchai Damrong-ongtrakun; born 25 June 1974) is a Thai football manager and former professional football player, who is the current head coach of Thai League 2 club Chonburi.

He played as a winger and an attacking midfielder.

He played for the national team from 1993 to 2004, scoring 10 goals.

On 14 December 1998, he scored the winning goal against South Korea at the 1998 Asian Games on home soil.

[1] On 20 June 2024, Thawatchai was appointed head coach of Thai League 2 side Police Tero.