CTF

• 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