TDF

TDF may refer to:

Rebel group

 * Tigray Defense Forces, a rebel group against the Ethiopian government situated in Tigray.

Defense force

 * Territorial Defense Forces (Ukraine), the reserves of the Armed Forces of Ukraine

Technology

 * Tab delimited files, a tabular data file format
 * Télé Distribution Française, a radio clock signal transmitter in France
 * TenDRA Distribution Format, a design of abstract machine
 * Tenofovir disoproxil fumarate, an antiretroviral drug
 * Testis determining factor, a gene (or product thereof) that results in maleness
 * Tire-derived fuel, recycled chipped tires burned for fuel
 * Trusted Data Format, a data tagging and protection standard used both commercially and by the United States Intelligence Community and US Department of Defense

Arts

 * The Dayton Family, an American horrorcore group
 * Thessaloniki Documentary Festival, a documentary film festival affiliated with the International Thessaloniki Film Festival
 * Totally Dysfunctional Family, known as TDF, the group pseudonym of Eric Clapton and other musicians for a one-off 1997 album
 * The Dhol Foundation, a dhol troupe from the UK

Other

 * Tour de France, a prestigious cycle race in France
 * TDF Group, a major French media and telecommunications conglomerate
 * Theatre Development Fund, a non-profit corporation dedicated to assisting the theatre industry in New York City
 * Theoretical Domains Framework, an implementation tool for Behavioural change theories
 * Total dietary fiber, the indigestible portion of food derived from plants
 * TDF, ticker of Templeton Dragon Fund on the New York Stock Exchange, see Companies listed on the New York Stock Exchange (T)
 * The Dawood Foundation, a Pakistani non-profit foundation founded by Ahmed Dawood
 * The Document Foundation, a non-profit organization that promotes open-source document handling software, particularly LibreOffice
 * Target date fund, a type of mutual fund whose asset mix becomes more conservative as the target date approaches
 * Tierra del Fuego, an archipelago off the southernmost tip of the South American mainland