Abstract: A collapsible partition assembly comprises an elongated arm which is pivoted to an elongated frame. The arm is pivotal between a storage position wherein the frame and the arm form an enclosure and a second position wherein the arm projects away from the frame to open the enclosure. A foldable partition is connected in fixed relationship with the arm and the frame so that the partition is substantially entirely enclosed in the enclosure when the arm is in a storage position. The partition expands to form a substantially rectangularly shaped panel. The partition is comprised of a plurality of flexibly connected elongated panel strips which cooperate to define a corrugated structure which is expandable and contractable relative to two generally orthogonal axes.