Abstract: An adjustable height rod support provides vertical support to rods, such as clothes closet rods, shower curtain rods, towel racks, etc. An embodiment of the rod support includes a housing, a spring, an insert, and a cradle. The spring and insert fit into the housing. The cradle is mounted on the insert. The apparatus is placed under the rod to provide vertical support. When the cradle receives the rod, the spring compresses commensurate with the weight of the rod and any items on the rod. The adjustable height rod support supports the weight of the rod and any items on the rod, thereby relieving stress on the rod itself, as well as the walls, brackets, etc., used to mount rod. The apparatus uses no mounting hardware for installation so it can be installed easily, without tools or fasteners. The apparatus is adjustable to various heights. The apparatus is light weight and thus portable.