Abstract: A disposable cat litter box includes a supporting base and a removable, disposable bag of litter which is designed to fit inside of the base. The disposable bag is provided with a draw string to facilitate its closure after use, and a cardboard bottom inside of the bag provides for a conforming fit of the bag within the base. In a modified embodiment, a plurality of disposable bags are nested inside of the base, and each bag is of a pleated structure with small reinforcement wires going in vertical and horizontal directions. This allows one side of the bag to be lifted upwardly within the base so as to form a deflecting shield which reduces the amount of litter spillage from the bag during a use of the box by a cat.