OCN

OCN is a three letter abbreviation that stands for:

Oncology Certified Nurse
Opaskwayak Cree Nation
Open College Network
Open Computer Network, a major Internet Service Provider in Japan
Open Cubicle Network, a news network targeted towards the New York City area
Orange County Newschannel, a defunct cable television news network targeted toward Orange County, California
Original Camera Negative, the film stock used in a movie camera
Orion Cinema Network, a Korean cinema network by On-Media
Originally called number, the phone number of the originally called party, regardless of call redirection.
Operating company number, in telephony, a number assigned by the National Exchange Carrier Association (NECA) to telecommunications carriers (including landline, wireless carriers, and resellers of various types). Also known as a «NECA Company Code».
Overclock.net, a forum for computer enthusiasts.

OCN may also refer to:

The chemical formula for a cyanate ion
The NYSE Symbol for Ocwen Financial Corporation
The IATA airport code for Oceanside Municipal Airport

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