The 2005 AFF U-23 Youth Championship was the first ever edition of the AFF U-23 Youth Championship, organised by ASEAN Football Federation.

The tournament was held from 29 August to 7 September in Bangkok, Thailand.

This tournament was also known as the pre-SEA Games tournament, as a preparatory tournament for the nations competing in the Manila SEA Games in December of the same year.

[1] All times are Thailand Standard Time (TST) - UTC+7