# CT

CT or ct may refer to:

## In arts and media

* c't (Computer Technik), a German computer magazine
* Carrick Times, Northern Irish newspaper
* Freelancer Agent Connecticut (C.T.), a fictional character in the web series Red vs. Blue
* Christianity Today, an American evangelical Christian magazine

## Businesses and organizations

* CT Corp, an Indonesian conglomerate
* CT Corporation, an umbrella brand for two businesses: CT Corporation and CT Liena
* C/T Group, formerly Crosby Textor Group, social research and political polling company
* Canadian Tire, a Canadian company engaged in retailing, financial services and petroleum
* Calgary Transit, the public transit service in Calgary, Alberta, Canada
* Central Trains (National Rail abbreviation), a former train operating company in the United Kingdom
* Czech Television, the public television broadcaster in the Czech Republic
* Community Transit, the public transit service in Snohomish County, Washington, U.S.
* Comunión Tradicionalista, a former Spanish political party
* CT (TV channel), a Filipino cable and satellite television network

## Finance

* Centime (ct), the French for "cent", used in English in several Francophone countries
* Stotinki (ст), the currency of Bulgaria

## Places

* CT postcode area, for Canterbury and surrounding areas in south-eastern England
* Connecticut (United States postal abbreviation)
* Province of Catania (vehicle registration code), Sicily, Italy
* Central African Republic (FIPS Pub 10-4 code and obsolete NATO diagram)
* Canton and Enderbury Islands (obsolete ISO 3166 country code), part of the Phoenix Islands in the Pacific Ocean
* Cape Town (capital city of the Western Cape, South Africa)
* Ct, for "Court"; a street suffix as used in the US

## Science and technology
### Biology and medicine

* Haplogroup CT, Y-DNA haplogroup.
* CT scan or X-ray computed tomography, a medical imaging method
* Calcitonin (symbol CT), a hormone produced in the thyroid gland
* Calibrated automated thrombogram (CT or CAT), a coagulation test
* Cardiothoracic surgery, the field of medicine specializing in chest surgery
* Chemotype (ct.), a chemically distinct entity in a plant or microorganism
* Cognitive therapy, a type of psychotherapy
* Connective tissue, a type of biological tissue
* Chelation therapy
* Chemotherapy
* Cholera toxin, a toxic protein secreted by Vibrio cholerae
* Threshold Cycle (C$_t$), see cycle of quantification/qualification
* COVID-19 test

### Computing

* Intel Ct, a SIMD multithreading programming model developed by Intel
* Certificate Transparency, in network security

### Other uses in science and technology

* CT Value, in drinking water disinfection
* Threshold cycle (C$_t$), a measure in the cycle of quantification/qualification of a real-time polymerase chain reaction
* Carat (purity) (ct), a measure of the purity of gold and platinum alloys
* Carat (mass) (ct), a unit of mass used for measuring gems and pearls
* Continuous-time signal, a varying quantity (a signal) whose domain is a continuum
* Center tap, a wire that is connected halfway along one of the windings of a transformer, inductor or a resistor
* Compliant Tower, a deepwater offshore oil platform
* Convective temperature, in atmospheric science
* Current transformer, a kind of transformer used in the electrical power industry

## Transportation

* Lexus CT, an automobile
* Honda CT series, a series of Honda bikes
* Crawler-transporter, a tracked vehicle used to transport the Space Shuttle from Vehicle Assembly Building to Launch Complex 39
* Civil Air Transport (IATA code)
* Training cruiser, a U.S. Navy hull classification
* Cybertruck

## Other uses

* Ct, a typographic ligature
* c. t. (cum tempore, Latin for "with time"), indicates that a lecture will begin a quarter-hour after the stated time; see Academic quarter
* Central Time Zone, a time zone in Canada, the United States, and Mexico
* Coffin Texts
* Conspiracy theory or theorist
* Counter-terrorism
* Cryptologic technician, a United States Navy enlisted rating or job specialty
* Chinese Taipei, the name used by Taiwan in some international organizations due to political pressure from the People's Republic of China
* ct followed by a number means the number of items contained in a cardboard (e.g. zucchini 3 ct)
* Corps Turd, etymologically "Cadet in Training", member of the Texas A&M Corps of Cadets that is not in the band