ACD
- ACD (album)
- ACD (gene)
- ACD (telecommunications company)
- ACD San Marcial
- ACD Systems
- Activity cycle diagram
- Activity-centered design
- Adelaide College of Divinity
- Adjournment in contemplation of dismissal
- Advanced Chemistry Development
- African Congress of Democrats
- Alcides Fernández Airport
- Allergic contact dermatitis
- Alveolar capillary dysplasia
- Anemia of chronic disease
- Antecedent-contained deletion
- Anti-collision device
- Apple Cinema Display
- Aragonite compensation depth
- Arbeitsgemeinschaft der Christengemeinden in Deutschland
- Arthur Conan Doyle
- Asia Cooperation Dialogue
- Asiatic Cavalry Division
- Australasian College of Dermatologists
- Australian Cattle Dog
- Automatic call distributor
- Autoregressive conditional duration
- Average call duration
- Centre Right Alliance (Romania)
- Kyode language