GDF

GDF may stand for:
* Grateful Dead Family
* Game Definition File, a file that describes a game to the Windows Vista Games Explorer
* Game Development Framework
* Gaz de France
* GD Font, a font for use with the GD Graphics Library
* General Data Format for Biomedical Signals
* Geographic Data Files
* GEODraft Database File, a proprietary file format of the documents created by the [http://www.geodraft.com GEODraft] well log authoring application.
* Global Development Finance
* Gnutella Developers Forum
* Graphic Design File, a file produced by the Altera Quartus software as a logical design schematic
* Growth and differentiation factor - a subfamily of proteins belonging to the transforming growth factor beta superfamily
* Guides de France
* Guyana Defence Force
* Gurps Data File - An expansion file for the Gurps Character Assistant role playing aide.