Thongchai Rungrenagles (; born 8 December 1986) is a Thai professional football manager who is the head coach of Thai League 2 club Chanthaburi .
Rungrenagles obtained a AFC Professional Coaching Diploma and started his managerial career as assistant manager of the Thailand national under-19 football team in 2015, helping the team win the 2015 AFF U-19 Youth Championship. In 2018, he was appointed manager of the Thailand national under-17 football team.
One year later, he was appointed as a youth manager of Thai side BG Pathum United. In 2020, he was appointed manager of Cambodian side Prey Veng. Subsequently, he was appointed manager of Phrae United in 2022. During his first season with the club, he helped them achieve qualification to the promotion play-offs. However they were unable to achieve promotion, knocked out in the semi-finals.
Individual