CDT

• Carbohydrate deficient transferrin, a transporter protein isoform typically increased in alcoholism • Compulsory drug test • Current Dental Terminology, a coding system of the American Dental Association • Cytolethal distending toxin, a bacterial genotoxin produced by Gram-negative bacteria • Clock drawing test • Clostridioides Difficile Toxin test that detects Clostridioides difficile toxin A and Clostridioides difficile toxin B ==Chemistry==

• Cyclododecatriene, a cycloalkene used in the production of polyamides ==Organisations==

• Canadian Deaf Theatre • CD Tenerife (Club Deportivo Tenerife), a Spanish football club • C.D. Tondela (Clube Desportivo de Tondela), a Portuguese football club • Center for Democracy and Technology • Centre for Doctoral Training or Doctoral Training Centre, an organisation of PhD programmes at UK universities • Children's Dance Theatre, University of Utah • China Datang Corporation, a power generation business in the People's Republic of China • China Digital Times, a bilingual news website covering Chinese politics • Confédération Démocratique du Travail: • Democratic Confederation of Labour (DRC), a trade union in the Democratic Republic of the Congo • Democratic Confederation of Labour (Morocco), a trade union • Crimson Dance Team, of Harvard College • Translation Centre for the Bodies of the European Union (''Centre de Traduction des Organes de l'Union Européenne'') ==Other==

• Cañon Diablo troilite (pyrrhotite), a standard for comparing sulfur isotopes • Causal dynamical triangulation, an approach to quantum gravity • Causal decision theory, a school of thought within decision theory • Central Daylight Time • Australia Central Daylight Time, a time zone in Australia • Central Daylight Time, observed in the North American Central Time Zone • launch countdown time used by ISRO (similar to Mission Elapsed Time) • CDT (TV station), a TV station in remote eastern and central Australia • Centre Daily Times, a newspaper for Centre County, Pennsylvania • Commandant, military title • Conceptual dependency theory • Constrained Delaunay triangulation • Continental Divide Trail • Craft, Design and Technology, a subject in schools in the United Kingdom • Eclipse C/C++ Development Tooling, see Eclipse (software) • IATA code of Castellón–Costa Azahar Airport • MRT station abbreviation of Caldecott MRT station • Colorado Department of Transportation