Provided herein are compression pad window hanging devices and systems. Compression pad window hanging devices include a compression pad attached to an item, with the compression pad designed to be compressed between the lower sash of a closed window and a window sill to thereby secure the item in place on an exterior or interior of the window. Such window hanging devices can include one or more adjustable support members extending from a bottom of the item to support the item on the exterior or interior window sill ledge and compensate for a downward slope of the exterior or interior window sill ledge. Bird feeders, flags, decorations and storage systems are examples items to be secured to a window sill using a compression pad window hanging device and system as disclosed herein.
