CET
- Caesars Entertainment Corporation
- Canadian Equestrian Team
- Carbon emissions trading
- Carrier Ethernet
- Center for Environmental Technology
- Central England temperature
- Central European Time
- Certified engineering technologist
- Cet, Albania
- Cetus (constellation)
- Cognitive evaluation theory
- Colchester Town railway station
- College English Test
- College of Engineering and Technology
- College of Engineering, Trivandrum
- Colombo Electric Tramways
- Comcast Entertainment Television
- Common Eligibility Test
- Common Entrance Test
- Community Educational Television
- Control-flow enforcement technology
- Coventry Evening Telegraph
- FV180 Combat Engineer Tractor
- WCET-TV