DTA may refer to:
- Deferred tax assets, an accounting concept
- Don't Trust Anyone, the central theme of clothing company DTA Posse
- Downtown Annapolis Maryland
- Detainee Treatment Act
- Democratic Turnhalle Alliance of Namibia
- Dental Technologists Association
- Digital television adapter, (also known as a digital transport adapter), a digital-to-analog converter
- Digital telephone adapter, (also known as a Telephone VoIP Adapter)
- Development trust association
- Differential thermal analysis
- Divisão de Transportes Aéreos, the former name of TAAG Angola Airlines
- Docosatetraenoic acid
- Domestic Tariff Area
- Double Tax Agreement, another name for a Tax treaty
- Dublin Transport Authority, another name for the National Transport Authority, the proposed transport authority for Dublin, Ireland
- Duluth Transit Authority
- DownThemAll!, a download manager/accelerator extension for Mozilla Firefox
- Death to America
- .dta, a file format used by:
- Stata, a statistics application
- sequest, a tandem mass spectrometry data analysis program used for protein identification