TDF explained

TDF may refer to:

Rebel group

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

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

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

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

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