Collection user interface techniques are described. In one or more implementations, a plurality of inputs are recognized as gestures received via interaction with a user interface to navigate through a file system of a computing device and select representations of objects managed by file system of the computing device, at least two of which are accessible via different devices. In response, copies of the representations are displayed by the computing device in a collection portion of the user interface. An option is output in conjunction with the collection portion by the computing device that is selectable to initiate a command to be performed using the objects that have corresponding representations included in the collection portion.