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. Deuterium fluoride, a form of hydrogen fluoride using deuterium atoms
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)
See also Dongfeng (disambiguation) Distrito Federal (disambiguation)