Abstract: A portable workstation for a ladder includes: a base section having a work area; a supporting surface adapted to rest upon an outer surface of the legs; a retaining section adapted to extend between and past the legs; a lateral cavity in a lower surface of the retaining section, adapted to engage with the rung; and a lateral aperture in the retaining section, adapted to receive a rod underneath the legs of the ladder that extends beyond the legs of the ladder so as to press up against an inner surface of the legs. When the rod is inserted into the aperture, the workstation rests upon the legs and rung, and the rod presses up against the legs to retain the workstation.