DF
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DF or df may stand for:
- df, a Unix command to report disk space usage by filesystem
- direction finding, a technique used to locate a radio transmitter
- Distrito Federal, e.g. the Mexican Federal District, including most of Mexico City
- Despair Faction, a group of AFI fans considered to be the most devoted, see http://despairfaction.com/
- Methylphosphonyl difluoride, a chemical weapons precursor listed in schedule 1 of the Chemical Weapons Convention