OCN

OCN is a three letter abbreviation that stands for:

• OCLC Control Number, a bibliographic record identifier
• In Oncology nursing, an 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
• [Order Confirmation Number. In many ERP is the way to record purchase orders

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