A privacy door assembly providing a sliding privacy door and supporting panel for selectively closing an entryway in an existing workspace panel system. The support panel includes a front face, top edge, side edge, and bezel opposite the side edge. The support panel attached facewise to a system panel of the workspace panel system form an enclosure for slideably supporting and concealingly receiving the privacy door. The support panel further includes adjustable floor glides for leveling and supporting the weight of the support panel and the attached privacy door. The privacy door may include a recessed pull handle for pulling the door from its concealed position and extending it across the opening to be closed or a spring loaded plunger for propelling the door slightly from the concealed position. A receiving post may be located adjacent to an additional component of the workspace panel system across the opening from the support panel. The receiving post receives a leading edge of the privacy door and can positively retain the receiving door with the use of magnets or a latching system. The privacy door is composed of fiberboard, polycarbonate, marker board, or other lightweight rigid material. The support panel may include a releasably attached aesthetic tile that provides an aesthetic match with the existing panel system.