CTF may refer to:
Organizations and associations
- Cambridge Theological Federation, association of colleges etc. in Cambridge, England
- Canadian Taxpayers Federation
- Canadian Teachers' Federation
- Child Trust Fund, a UK child savings scheme
- Children's Tumor Foundation, United States, supports those with neurofibromatosis/schwannomatosis
- Clean Technology Fund
- Cyprus Tennis Federation
- Chow Tai Fook, Hong Kong based conglomerate
Science and technology
- Capture the flag (cybersecurity), an educational exercise in computer security
- Charge trap flash
- Chlorine trifluoride, a highly corrosive chemical
- Collaborative Translation Framework, a platform designed by Microsoft to improve machine translation through (possibly crowdsourced) user contributions
- Computer to film, an imaging technology used in lithographic printing
- Contrast threshold function, in physiological imaging
- Contrast transfer function, in general imaging
- Controlled thermonuclear fusion
- CTF, an undocumented Windows protocol involved with the Microsoft Text Services Framework
- Cut-through forwarding, a methodology used in network hardware
Transport
- Catford railway station (National Rail station code), London, England
- Coatepeque Airport (IATA code), Guatemala
Other uses
- Canadian Television Fund
- Capture the flag, a traditional outdoor game often played by children
- Colorado tick fever
- Combined Task Force
- Commander, Task force
- Controlled Traffic Farming, a soil protection driving strategy
- Correctional Training Facility at Soledad, California
- Counter terrorism financing