PCN may refer to:
- Pacific Investment Management PCN (stock symbol), PIMCO Corporate Income Fund of Allianz, Germany
- Partido de Conciliación Nacional, a political party in El Salvador
- Partidul Comuniştilor Nepecerişti, a political party in Romania
- Pavement Classification Number, a code classifying different kinds of surface at airports
- Pecked curvilinear nucleated, in archaeology, a form of preshistoric rock carving
- Penalty Charge Notice, an FPN issued by parking attendants
- Penicillin (abbreviation)
- Pennsylvania Cable Network, non-profit cable television network of Pennsylvania, United States
- Personal Communications Network, mobile telephone system, Europe
- Picton Airport, New Zealand
- Polychlorinated naphthalene, an organic pollutant
- Potato cyst nematode, an agricultural pest
- Program Composition Notation, a language for parallel programming
- Process control network, a communications network that is used to transmit instructions and data between control and measurement units and Supervisory Control and Data Acquisition (SCADA) equipment
- Putnam City North High School
- pcn is also the name of the OpenBSD AMD PCnet-PCI 10/100 Ethernet device driver
- Pcn, the abbreviation for orchid genus Polycycnis
- p.C.n. is a modern Latin abbreviation for Post Christum Natum ("After the Birth of Christ") used when writing in Latin to denote dates which in English would be denoted as AD (the term did not exist in antiquity)