Systems and methods are provided for file searching on mobile devices. A system includes a user interface and a file query system. The user interface is for receiving a user-provided spatio-temporal query for use in searching for a particular file. The user-provided spatio-temporal query is provided by a user of a mobile device. The file query system is for determining information about the particular file responsive to the user-provided spatio-temporal query, and identifying from the information one or more files as a search result for the particular file.