Abstract: An extension ladder tool caddie is provided that comprises an elongated bridge portion having a first and second end receptacle portion adapted to receive the upper rail ends of an extension ladder fly therein. The caddie is supported by the upper rail ends and is positioned therebetween to form an upper ladder rung that supports tools for a worker along the ladder. The bridge portion of the device includes an open upper having a plurality of defined cavities for supporting different hand tools, appliances, and fasteners therein for stable containment thereof and ready access thereto. A first and second tab is further provided along the exterior sidewall of the bridge portion for supporting suspended tools such as paint brushes and screw driver tools. The assembly is specifically suited for extension ladders and provides a tool caddie at the upper, open portion of the extension ladder fly.