The 2003 Philippine Basketball Association (PBA) All-Filipino Cup, or known as the 2003 Samsung-PBA All-Filipino Cup for sponsorship reasons, was the first conference of the 2003 PBA season.
The tournament is an All-Filipino format, which doesn't require an import or a pure-foreign player for each team.
Batang Red Bull won 10 of their first 11 games of the season.
[1] The Thunder were on a nine-game winning streak before suffering back-to-back losses to Talk 'N Text and FedEx.
[3] Talk 'N Text and Coca Cola advances to the semifinals, the Phone Pals defeated Barangay Ginebra, 99-86, while the Tigers nip Batang Red Bull, the team with the best record in the eliminations, 80-79.