The 2004 SLC Twenty20 Tournament is the 1st season of the official Twenty20 domestic cricket competition in Sri Lanka.

15 teams in total, five representing four provinces of Sri Lanka and a Sri Lanka Schools XI team participating in the competition.

The competition began on 17 August 2004, when Bloomfield Cricket and Athletic Club played the Police Sports Club at Colts Cricket Club Ground, Colombo.

This season comprised eight regular matches, four quarter finals, two semi finals and a final.

This article related to a Sri Lankan domestic cricket competition is a stub.