All of 12 teams from member associations of the ASEAN Football Federation are eligible for the tournament. The reigning ASEAN U-19 champions − Australia did not enter the tournament. At the 9th meeting of the AFF Council, New Zealand were interesting at to be an invited guest for the AFF U-18 Championship 2017.[1] Official draw were also conducted to decide on the match-ups of the competitions and New Zealand were in Group B. However, New Zealand withdrew from the tournament, based on the latest schedule.[2]
A total of 11 teams from 11 member associations enter the tournament, listed below:
Updated to match(es) played on 9 September 2017. Source: AFF (E) Eliminated; (H) Hosts; (X) Cannot win group but may still advance to knockout stage via second place