A collapsible corner animal cage is provided. The collapsible cage comprises a first set of side walls fastened together to define the rear corner of the cage; a second set of side walls fastened to the first set of side walls to define the side corners of the cage; a door panel fastened to the second set of side walls to define the front of the cage, the door panel positioned diametrically opposite the rear corner of the cage; a floor fastened to the side walls and the door panel; and a roof fastened to the side walls and the door panel; wherein the side walls, door panel, floor and roof are fastened together to define a collapsible structure for use in a corner. The cage may also be collapsed into a one-piece, substantially flat unit with a carrying handle for transport.