CTR

CTR may refer to:

Engineering, science and technology

 * Counter mode (CTR mode), a cryptographic mode of operation for block ciphers
 * X-ray crystal truncation rod, a technique to measure properties of crystal surfaces
 * Current transfer ratio, in an opto-isolator device
 * Content Threat Removal, a cyber security technology that defeats content threats

Government

 * Cooperative Threat Reduction, an initiative to secure and dismantle weapons of mass destruction in former Soviet Union states
 * Currency transaction report, a report about transactions that the Bank Secrecy Act requires U.S. financial institutions to file with the Internal Revenue Service

Media, arts and entertainment

 * Contemporary Theatre Review, a British academic journal of performing arts
 * Crash Team Racing, Naughty Dog's 1999 video game for the Sony PlayStation
 * Crash Team Racing Nitro-Fueled, its 2019 remake

Medicine

 * Cardiac resynchronization therapy
 * Cardio-thoracic ratio, a measure of the size of heart
 * Carpal tunnel release, surgery for treating carpal tunnel syndrome
 * Cervico-thoracic ratio, a measure of segmental mobility in the spine
 * Clinical trials registry, an official catalog for studies about health interventions, such as drugs

Organizations

 * Center for Transportation Research UT Austin, a research center at the University of Texas at Austin, US
 * Center for Turbulence Research, a research institute at Stanford University, US
 * Correct the Record, an American political action committee which supported Hillary Clinton's 2016 presidential campaign
 * Computing-Tabulating-Recording Company, a company that was renamed IBM in 1924

Transport

 * Aerolíneas Centauro (ICAO airline designator: CTR), an airline in Mexico
 * Cattle Creek Airport (IATA airport code: CTR), an airport in Australia
 * Controlled traffic region, a controlled airspace zone, typically around airports
 * Carlton Trail Railway, a Saskatchewan, US shortline railway
 * Chester railway station (station code), England

Automobile models

 * Honda Civic Type R, a car manufactured by Honda
 * Ruf CTR, a car by Ruf Automobile of Germany

Other uses

 * Click-through rate, a measure of the success of an online advertising campaign
 * "Choose the right", a common Latter Day Saint saying, often found on a CTR ring
 * Close target reconnaissance, a military term for scouting in extremely close proximity to the target
 * Competitive trail riding, an equestrian sport
 * Costa Rica, ITU country code