ACD may refer to: Brands and enterprises ACD (telecommunications company), carrier and Internet Service Provider, headquartered in Lansing, Michigan ACD Systems, a computer software manufacturer Advanced Chemistry Development (ACD/Labs), a chemistry software company Organizations ACD San Marcial, a Spanish football team based in Lardero, La Rioja Adelaide College of Divinity, an Australian theological college Arbeitsgemeinschaft der Christengemeinden in Deutschland (Association of Christian Churches in Germany) Asia Cooperation Dialogue, an international organization Centre Right Alliance (Romania) (), a political alliance Australasian College of Dermatologists, a medical specialist college People Arthur Conan Doyle, creator of Sherlock Holmes Science and healthcare ACD (gene), protein encoded by the ACD gene α-Cyclodextrin, a glucose polymer Alveolar capillary dysplasia, disorder of the lung Anemia of chronic disease, form of anemia Aragonite compensation depth, a property of oceans Allergic contact dermatitis, form of contact dermatitis Technology Activity-centered design, design based on how humans interact with technology Anti-collision device, on Indian railways Apple Cinema Display, a line of monitors Automatic call distributor, device that directs incoming phone calls Average call duration, average length of telephone calls Other uses ACD (album), a 1989 album by Half Man Half Biscuit Adjournment in contemplation of dismissal, court ruling to defer the disposition of a defendant's case Antecedent-contained deletion in grammar Activity cycle diagram, a systems modelling paradigm Autoregressive conditional duration, a class of models used in financial econometrics Kyode language (ISO 639-3 code), a Guang language of Ghana Australian Cattle Dog, a breed of herding dog Alcides Fernández Airport, an airport in Acandí, Colombia