The ASEAN U-19 Boys' Championship (formerly AFF U-19 Youth Championship) is an biennal international football competition contested by the national teams of the members of the ASEAN Football Federation (AFF) and occasionally invited nations from the rest of Asia.
The tournament was previously played at under-20 level (except in 2003 when it was a special under-18 competition), however the AFF followed the lead of the Asian Football Confederation after they renamed its U-20 competition to fall in line with FIFA's naming conventions and also to reflect the age of the players at the competition. Thailand were the champions in the first ever edition in 2002.