the Tour de France cycle race

Télé Distribution Française

Tab delimited files, a tabular data file format

Testis determining factor

The Dhol Foundation, a dhol troupe from the UK

Theatre Development Fund

Télédiffusion de France or TDF Group, a major French media and telecommunications conglomerate

TenDRA Distribution Format, a design of abstract machine

Tenofovir disoproxil fumarate, the antiretroviral drug

Tour de Future (Australia), the Commodore 64 software production group

Taurian Defense Force, a fictional military in the BattleTech Universe

Totally Dysfunctional Family, the group pseudonym of Eric Clapton and other musicians for a one-off 1997 album [1].