The 2004 SEABA Under-18 Championship was the qualifying tournament for Southeast Asia Basketball Association at the 2004 FIBA Asia Under-18 Championship.

The tournament was held in Lucena, Quezon, the Philippines from April 14 to April 17.

Quezon Convention Center was the venue of all the games.

[1] The hosts won their third overall title by sweeping all of their assignments to earn right to represent SEABA together with the second-placer Singapore.

Indonesia was supposed to participate at the tournament but withdrew a few days before the first match was due to be played[2]