TCN is a television station in Sydney, Australia, with initials standing for "Television Corporation New South Wales".

TCN may also refer to:

Broadcast media

• The Comedy Network, a Canadian comedy TV channel owned by Bell Media
• The Country Network, an American TV channel broadcasting country music videos
• The Comcast Network, a regional sports network owned by Comcast broadcasting in the Eastern United States
• The Cartoon Network, a holding company for Cartoon Network and Adult Swim brands, owned by Warner Bros. Discovery
• Tucker Carlson Network, a subscription video on-demand streaming service launched December 2023

Science and technology

• Tetracycline, an antibiotic used to treat conditions including cholera, brucellosis, plague, malaria and syphilis
• Train communication network, a fieldbus standard used in train control systems, described in IEC 61375
• Topology change notification in Spanning Tree Protocol, an ethernet networking protocol
• Terrestrial Cosmogenic nuclide, rare isotope found on the earth surface

Other uses

• The Chronicles of Narnia, a series of seven fantasy novels for children written by C. S. Lewis
• The Curling News, a sports publication first launched as Canadian Curling News
• Take Care Now, a provider of out-of-hours medical services in England, now defunct
• Transportation Communications Newsletter, an electronic newsletter published since 1998
• Third country national, a designation in migration contexts, or regarding public-sector contracts