DF

DF or df may refer to:

Gaming

 * DeFRaG, a modification for the computer game Quake III Arena
 * DragonFable, a 2006 video game by Artix Entertainment
 * Dwarf Fortress, a 2006 sandbox-style computer game

Places

 * Distrito Federal (Brazil), or the Federal District
 * Distrito Federal (Mexico), or the Federal District, now known as Mexico City

Politics

 * Danish People's Party (Dansk Folkeparti)
 * Democratic Front (Bosnia and Herzegovina) (Demokratska fronta)
 * Democratic Front (Montenegro) (Demokratski front)

Science and technology

 * df (Unix), a Unix command to report disk space usage by a filesystem
 * Dairy free, identifying products that contain no milk
 * Decapacitation factor, in biochemistry
 * Degrees of freedom, various measures in statistics, mathematics and physics
 * Density function, a mathematical function with a wide range of applications
 * Dielectric loss
 * Direction finding, a technique used to locate radio transmitters
 * Direction flag, a flag stored in the FLAGS register on all x86-compatible CPUs
 * Dissipation factor, a measure of loss-rate of energy of an oscillation mode in a dissipative system
 * Dongfeng (missile), a Chinese intercontinental ballistic missile
 * Dongfeng series of diesel locomotives
 * China Railways DF
 * China Railways DF4
 * China Railways DF8
 * Methylphosphonyl difluoride, a chemical weapons precursor
 * Daylight factor (DF), the ratio of the light level inside a structure to the light level outside the structure.

Other uses

 * Defender (association football)
 * Delta Force, a component of the U.S. Army Joint Special Operations Command
 * Design Factory, a department of Aalto University
 * Duty Free, goods which are free from tax or duty
 * New Zealand DF class locomotive (1979)
 * Quantum Air (formerly AeBal), Spanish airline (IATA code DF)