Abstract: A retractable shower expander assembly for a shower stall or tub enclosure having an access opening includes a shower expander rod, two expander ports and a tension rod. The shower expander rod is formed with right angles on each end and is selectively adjustable in the middle to fit various access opening widths. The retractable shower expander assembly, being portable, is held in place by means of an adjustable tension rod, that, when enjoined inside the cavities of the two expander ports, holds the retractable shower expander assembly horizontally and fixedly in use against the two end walls of a shower stall or tub enclosure at the top of the access opening. A shower curtain is attached to the shower expander rod by hooks or rings that can slide along the shower expander rod to selectively close or open the access opening of a shower stall or tub enclosure.