DDA
DDA is an abbreviation for:
- Umbrella Association of German Avifaunists , non-profit association of all national or regional ornithological associations in the Federal Republic of Germany
- Department for Disarmament Affairs Main Department for Disarmament Affairs of the UN Secretariat
- German Dan Academy
- German Dialog Marketing Academy GmbH, Haan
- Deutsche Drogisten-Akademie , former technical college in Braunschweig, see Drogist # Deutsche Drogisten-Akademie
- Dichlorodiphenylacetic acid
- Digital Differential Analyzer was an electromechanical analog computer
- Doha Development Agenda , English term for the Doha Round
- Dresden Official Gazette , official publication organ of the Saxon state capital Dresden
