The Thailand national under-20 football team (Thai: ฟุตบอลทีมชาติไทยรุ่นอายุไม่เกิน 20 ปี, RTGS: futbon thim chat thai run ayu mai koen yi sip pi) is the national team for the under-20 and 19 level, representing Thailand in international football competitions in the FIFA U-20 World Cup, AFC U-20 Asian Cup and AFF U-19 Youth Championship.

It is controlled by the Football Association of Thailand.

Thailand has never managed to qualify for the FIFA U-20 World Cup, but the under-17 national team has done so.

The following 23 players for the 2025 AFC U-20 Asian Cup.

This is a list of honours for the Thailand national under-20 football team.