GRAFFLE is the extension given to files used by the OmniGraffle program. It is a tool for creating diagrams, charts and computer creation of images or illustrations. GRAFFLE files are used to store user projects created in the program. Apart from the image itself, such a file contains additional information such as text or page size and layout.

OmniGraffle was developed by The Omni Group as an application for systems running on Apple devices.