RCN may refer to:
- Radio Cadena Nacional (disambiguation), a broadcast network in Colombia
- RCN Corporation (formerly Residential Communications Network), a cable television, telephone, and Internet service provider in the United States
- Radiowe Centrum Nadawcze, Polish designation for a broadcasting transmitter
- Reality Check Network, a software based warez magazine that existed from 1995 to 1997
- UWC Red Cross Nordic, a United World College in Norway
- Reformed Church of Newtown, a church in Queens, NY
- Republic of Cinnabar Navy, the setting of the RCN Series of science fiction novels by David Drake
- Royal Canadian Navy
- Royal College of Nursing, a professional membership organisation of the United Kingdom
- Rundstrecken Challenge Nürburgring is a motorsport event series mainly on the Nürburgring
- American River Airpark, IATA airport code "RCN"
- Research Council of Norway
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