CDT or CdT may refer to:

Medicine 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