ATD
# ATD

ATD may refer to:

## Computing and technology

* Anthropomorphic test device, also known as a crash test dummy
* at (command) or @daemon (spelled "atd", lower case), a standard Unix program
* Azimuth tractor drive, a drive system for tugboats

## Medicine and science

* 1,4,6-Androstatrien-3,17-dione, estrogen inhibitor
* Acute tryptophan depletion
* Anti-thyroid drugs or antithyroid agent

## Other uses

* ATD Fourth World
* Against the Day, a Thomas Pynchon novel
* Association for Talent Development
* Attention to Detail, a defunct British video game developer
* the postal code of Attard, Malta
