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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
  • 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, in telephony, the phone number of the originally called party, regardless of call redirection; look inside a Signalling System No. 7 (SS7) ISDN User Part (IUP) initial address message (IAM) for this optional parameter
  • Operating Company Number, in telephony, a code used in various iconectiv telephony products, a major subset of which equate to Company Codes assigned by the National Exchange Carrier Association (NECA) to telecommunications carriers (including landline, wireless carriers, and resellers of various types).
  • Order confirmation number, a method for recording purchase orders in many Enterprise resource planning (ERP) systems

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