CDA
- Automobile drag coefficient
- Canadian Defence Academy
- Canadian Dental Association
- Cantor's diagonal argument
- Capital Development Authority
- Capital Development Authority (Islamabad)
- Caran d'Ache (company)
- Cardinia Road railway station
- Cassini–Huygens
- Catholic Daughters of the Americas
- Cellular digital accessory
- Central Delta Academy
- Chantiers de l'Atlantique
- Chargé d'Affaires
- Child Detection Agency
- Child Development Associate
- Chinese Daoist Association
- Chiral derivatizing agent
- Chittagong Development Authority
- Chlorproguanil/dapsone/artesunate
- Christian Democratic Alliance (South Africa)
- Christian Democratic Appeal
- Christian democratic
- Clinical Document Architecture
- Club de Deportes Antofagasta
- Coeur d'Alene (disambiguation)
- College Democrats of America
- Combined Development Agency
- Command and data acquisition station
- Communications Decency Act
- Communicative Disorders Assistant
- Communicative disorders assistant
- Compact Disc Audio track
- Completely denatured alcohol
- Confidential disclosure agreement
- Congenital dyserythropoietic anemia
- Conservative Democratic Alliance
- Continuous descent approach
- Coram Deo Academy
- Crime and Disorder Act 1998
- Criminal defense attorney
- Critical discourse analysis
- Current differencing amplifier
- Cytidine deaminase
- Diabetes Canada
- Dominicana de Aviación
- Linear discriminant analysis
- Oncidium
- Red Book (audio CD standard)