CTI may stand for:
- Corner Travel Index
- DePaul University School of Computer Science, Telecommunications and Information Systems at DePaul University
- CTI Consultants
- Coral Triangle Initiative, consists of Indonesia, Malaysia, Papua New Guinea, Philippines, Solomon Islands and Timor Leste
- Chung T'ien Television, a television network in Taiwan.
- CTI Móvil, a Latin American mobile network operator.
- City Telecom (Hong Kong), a Hong Kong telecommunication services provider
- Commission des Titres d'Ingénieur
- Computer telephony integration
- Cryptologic Technician Interpretive, a branch of the United States Navy Cryptologic Technician rating
- CTI Records, a jazz record label founded in 1967 by Creed Taylor
- Comparative Tracking Index
- Conspiracy International, an independent record label run by Chris & Cosey
- Cuito Cuanavale Airport, an Angolan airport with this IATA code
- Cuerpo Técnico de Investigación ("Technical Investigative Corps"), a Colombian government agency.