The National Super League 4-Day Tournament is a domestic first-class cricket competition, which is held annually in Sri Lanka.

Five cricket teams representing five districts of the country take part in the tournament.

[1] The league is organized by the Sri Lanka Cricket (SLC) beginning in the 2022 season.

[3] The squads for the competition are announced based on the performances in the Major League Tournament, with 26 clubs clustered under five teams.

[4] The tournament serves as the criteria to select players for Sri Lanka's Test squad.