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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

See also

• Center (disambiguation) (Center or Centre) for which CTR is an abbreviation of several values
• Control (disambiguation) for which CTR is an abbreviation of several values
• All pages with titles beginning with CTR
• All pages with titles beginning with Ctr
• All pages with titles containing ctr
• CTRS

• Disambiguation pages