| Acronym | Definition |
|---|
| CTT | Cable Television Toyama (Toyama, Japan) |
| CTT | Correios (Portuguese Postal Service) |
| CTT | Classic Toy Trains (magazine) |
| CTT | Contrat de Travail Temporaire (French: Temporary Work Contract) |
| CTT | Charity Technology Trust |
| CTT | Certified Technical Trainer |
| CTT | Character to Text |
| CTT | Click to Type |
| CTT | Center Tapped Terminated |
| CTT | Contact List |
| CTT | Copy to Texture |
| CTT | Compatibility Test Tools |
| CTT | Connection Traffic Table |
| CTT | China Taiwan Time |
| CTT | Computational Technology Toolkit |
| CTT | Currency Transaction Tax (various locations) |
| CTT | Career Technical Training (various organizations) |
| CTT | Columbia Tristar Television (studio) |
| CTT | Club Tennis de Table (French: Table Tennis Club) |
| CTT | Can't Touch This (gaming clan) |
| CTT | Cholesterol Treatment Trialists' (collaboration) |
| CTT | Centre for Technology Transfer (various agencies) |
| CTT | Cape Town Tourism (South Africa) |
| CTT | Conversion to Type (training; UK) |
| CTT | Chicago Tap Theatre (dance company) |
| CTT | Club Time Trial (stock car racing) |
| CTT | Cairns Tilt Train (Australia) |
| CTT | Connect the Thoughts (curricula) |
| CTT | Critical Thinking Test |
| CTT | Cotton-Top Tamarin (monkey) |
| CTT | Centre for Traffic and Transport (Denmark) |
| CTT | Common Task Training |
| CTT | Champagne Tennis de Table (French: Champagne Table Tennis; Champagne, France) |
| CTT | Commodity Transaction Tax |
| CTT | Cryptologic Technician (Technical) (USN Rating) |
| CTT | Cycles Tondeuses Tronçonneuses (French: Cycles Mowers Chainsaws) |
| CTT | Centre des Tubercules Tropicaux (French: Tropical Root Center) |
| CTT | Common Task Test (US Army) |
| CTT | Collaborative Team Teaching |
| CTT | Cartridge Tape Transport |
| CTT | Commander's Tactical Terminal |
| CTT | Cranial Tibial Thrust (veterinary medicine) |
| CTT | Correios, Telégrafos e Telefones (Posts, Telegraphs, and Telephones; Portuguese mail service) |
| CTT | Core Technical Team (various locations) |
| CTT | Character Translation Table |
| CTT | Continuous Treatment Team |
| CTT | Center-Tap Terminated (logic) |
| CTT | Color Trails Test (neuropsychology) |
| CTT | Centre Traditionnel de Taekwondo et Sonmudo (French: Traditional Taekwondo and Sunmudo Center) |
| CTT | Closed, Transferring, and Transferred (ranges) |
| CTT | Computer Telephone Technology (Covington, LA) |
| CTT | Chrétiens Tous Terrains (French: Christians of All Terrains; Switzerland) |
| CTT | Compatibility Test Trailer |
| CTT | Consorzio Toscano Trasporti (Tuscany Transport Consortium, Italy) |
| CTT | Combined Test Team |
| CTT | Comp Time Taken (employee time reporting) |
| CTT | Connection Traffic Table (Cisco) |
| CTT | Connecticut Transit |
| CTT | Capability to Transmit |
| CTT | Counter Timer Trigger |
| CTT | Compression Translation Table |
| CTT | Collaborative Tools Testbed |
| CTT | Common Test Training |
| CTT | Concur Tasktrees (notation) |
| CTT | Chronic Toxicity Test |
| CTT | Common Training Task |
| CTT | Counter Terror Teams |
| CTT | Combat Training Tank |
| CTT | Council for Travel and Tourism (UK) |
| CTT | Crew Transfer Tunnel |
| CTT | Cellular Transport Technology |
| CTT | Committee on Technology Transfer (various organizations) |
| CTT | Canadian Transportation Tribunal |
| CTT | Correios, Telefones e Telégrafos (Portugese: Post offices, Telegraphs and Telephones) |
| CTT | Cross Tabulated Table(s) |
| CTT | Cyber-Toothed Tigers (FFFBI) |
| CTT | Customer Trouble Ticket |
| CTT | Converged Technology Training (Cisco) |
| CTT | Cascaded Triplet Topology |
| CTT | Combat Theater Trainer |
| CTT | Computerized Transmission Tomography (clinical scanning method) |
| CTT | Contractor Technical Test |
| CTT | Crosby Township Trustees |
| CTT | Communications Tactical Terminal |
| CTT | Currency Transaction Trust |
| CTT | Console Tape Transport |
| CTT | Corporate Transformation Team (NAVSEA) |
| CTT | CompTIA (Computing Technology Industry Association) Certified Trainer (information technology certification) |
| CTT | Chest Thoracostomy Tube |
| CTT | Cyrillic True Type (font) |