CTN may refer to:
Television
- Christian Television Network, a Christian broadcast television network in the United States
- mtvU, United States (formerly College Television Network)
- Connecticut Network, or CT-N (often misidentified as CTN)
- County Television Network, San Diego County's public-access television channel
- Community Tech Network, Nonprofit focused on digital literacy based in California and Texas
- Campus Television Network, a student station in the Republic of Ireland
- Cambodian Television Network, Cambodia
- Cartoon Network, a children's television network
- Chung T'ien Television, a television network based in Taiwan (formerly Chinese Television Network)
- bTV Action, a Bulgarian channel (formerly known as CTN)
Other uses
- CTN, Cryotech Nordic, a global technology innovator and manufacturer of cryotherapy devices in Finland
- CTN (retail), Confectionery, Tobacco, and News retailers
- CTN Communications, a creative communications agency based in London
- CTN Animation Expo, Creative Talent Network Animation Expo in Burbank, California
- Camp Tel Noar, a USA summer camp
- Compagnie Tunisienne de Navigation, a Tunisian ferry operator
- Croatia Airlines (ICAO airline designator: CTN)
- Cardiac troponin, see troponin test
- Central de Trabajadores Nicaragüenses, the Nicaraguan Workers' Centre
- Cryptologic Technician, a U.S. Navy specialist rating
- ctn is a notation for cotangent trigonometric function