CRT may refer to:

Medicine[link]

• Capillary refill time, the rate at with blood refills empty capillaries
• Cognitive Retention Therapy, a dementia treatment
• Cardiac resynchronization therapy, a treatment for heart failure
  • CRT-D, an implanted cardiac resynchronization device
• Corneal Refractive Therapy
• Certified Respiratory Therapist, a respiratory therapist who works under the direction of Registered Respiratory Therapists and Physicians

Other[link]

• Cathode ray tube, a type of vacuum tube used for information displays or oscilloscopes
• Casual Relief Teacher
• The C runtime library (part of the C standard library), in programming
• Criterion-referenced test, a type of exam
• Charitable remainder trust
• Connecticut Repertory Theatre, a regional equity theatre in Storrs, Connecticut
• Corneal Refractive Therapy, in optometrics
• Chinese Remainder Theorem, in mathematics
• Crystallographic restriction theorem, in mathematics
• Crt (genetics), a gene cluster
• Chongqing Rail Transit, a metro system in Chongqing, China
• Cross River Tram, in London, England, UK
• CRT Group, a transport company in Australia
• Chicago Rapid Transit Company, a defunct operator of the Chicago 'L'
• Continuously regenerating particulate trap, a filter used to handle particulate emissions from diesel engines
• Critical race theory, a school of social thought that applies critical theory to issues of race, law, and power
• The Current reality tree (TOC) of Theory of Constraints, in process management

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