Abstract: A collapsible swimming pool is provided which comprises a plurality of nestable sections. Each section has a bottom wall with an inner portion and a side wall which is connected with the bottom wall to extend in a generally vertical direction when the pool is set up for use. A retainer is provided for securing the inner portions together. The side wall of each section has generally vertical leading and trailing edges. A first locking flange is provided on the leading edge and a second locking flange is provided on the trailing edge. The first locking flange on the side wall of one section is interlockable with the second locking flange on the side wall of a next adjacent section to releasably secure all the sections together when the pool is set up.