| Acronym | Meaning |
| DA | Department of the Army |
| Da | Aerospace Drift (US DoD) |
| DA | Aerospace trajectory drift |
| DA | Damage Assessment |
| DA | Damaged Article |
| DA | Dartford (postcode, United Kingdom) |
| DA | Data Acquisition |
| DA | Data Automation |
| DA | Days After Acceptance |
| DA | Decision Agent (DMS component) |
| DA | Decision Altitude |
| DA | Defective Article |
| DA | Defense Acquisition |
| DA | Delayed Action |
| DA | Delegated Authority |
| DA | Democratic Alternative (Former Yugolsav Republic of Macedonia) |
| DA | Demographic Analysis (statistics; US Census Bureau) |
| DA | Dentalman Apprentice (Naval rating) |
| DA | Department of Agriculture (Phillipines) |
| DA | Department of Audit |
| DA | Departure Approved |
| DA | Deployment Assembly (NASA) |
| DA | Depot Availability |
| DA | Deputy Administrator |
| DA | Design Activity |
| DA | Design Agency (DOE) |
| DA | Design Authority |
| DA | Designated Acquisition Program |
| DA | Designated Agent |
| DA | Detonation-Control Algorithm |
| DA | Detroit Arsenal (Center Line, MI) |
| DA | Developing Activity |
| DA | Development Application (Australia) |
| DA | Development Assistance |
| DA | Devolved Administration (UK) |
| DA | Differencing Assembly |
| DA | Differentiated Accountability (US Department of Education) |
| DA | Diplomatic Academy (various locations) |
| DA | Direct Appointment (source of commission for military officers) |
| DA | Directed Action |
| DA | Directive Authorization |
| DA | Directorate for Administration (DIA) |
| DA | Directorate of Administration |
| DA | Disclosure Authorization |
| DA | Discretionary Absence |
| DA | Disproportionate Asset (taxes; India) |
| DA | Distribution Assembly (NASA) |
| DA | Divisional Accountant (India) |
| DA | Divisional Artillery |
| DA | Docking Adapter |
| DA | Domestic Abuse |
| DA | Domestic Affairs (UK ministerial committee) |
| DA | Double Agent (US DoD) |