Abstract: A disposable cat litter box includes a bottom portion for carrying litter material and formed with a relatively rigid lower portion having a bottom wall, a pair of upstanding side walls and a pair of upstanding end walls, and a foldable upper portion including a flap portion foldable between collapsed and extended positions attached to each of the side walls and end walls. A removable, relatively rigid lid dimensioned to fit on the bottom portion with the flap portions in either the collapsed or extended positions is also provided. Both the box bottom and removable lid are constructed from standard box blanks modified to include an entry/exit opening, a finger pull to facilitate gripping one of the flap portions, and a pair of gripping cut-outs in the lid.