A modular shelving system has a pair of vertical supports for a central stack of shelves. Each shelf is supported by a pair of shelf support brackets extending between the vertical supports and the back wall of a closet, for example. Each shelf has a plurality of sheet metal planks of generally trapezoidal cross section which elastically snap into complementary bosses along the tops of the shelf support brackets. Similar shelves extend from the central stack to side walls of the closet and are supported there by side wall brackets which also have bosses along the top complementary to the cross section of the planks. Some of the brackets have sockets for receiving the ends of hanger bars beneath the shelves.