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 is a two-time AFC champions and four-time AFF champions. Thailand has never managed to qualify for the FIFA U-20 World Cup, but the under-17 national team has done so.

泰国20岁以下国家足球队是代表泰国参加20岁以下国际足球比赛的足球队,由泰国足球协会管理。球队曾获得过1次东南亚青年足球锦标赛冠军、1次亚足联U-19亚锦赛冠军,并曾打进过一次国际足联U-20世界杯。