Abstract: An extension ladder supply container including a tubular shaft having an inner end and an outer end. The inner end has a movable collar coupled thereto. A basket is provided having an open upper end and a closed lower end. The basket is dimensioned for holding a paint can therein. The basket has a rod extending upwardly therefrom. An upper end of the rod has a collar secured thereto. The collar is rotatably coupled with the tubular shaft inwardly of the outer end thereof. A compressible foam rubber pad is secured to the movable collar of the tubular shaft. The foam rubber pad has a generally semi-cylindrical configuration. The foam rubber pad and the movable collar are receivable within an outer opening in a rung of an extension ladder.