PN
- .pn
- Adobe Presenter
- Friuli-Venezia Giulia
- Italy
- National Party (Uruguay)
- National Renaissance Front
- Neolithic
- Newton (unit)
- Pacific National
- Pakistan Navy
- Palmerston North
- Parenteral nutrition
- Part number
- Participatory notes
- Partit Nazzjonalista
- Path graph
- Patriotic Nigras
- Penang
- Pennsylvania Northeastern Railroad
- Perikatan Nasional
- Peruvian Navy
- Petri net
- Philippine Navy
- Phosphorus mononitride
- Phylogenetic nomenclature
- Pitcairn Islands
- Planetary nebula
- Polish notation
- Polynesian languages
- Polynomial vector spaces
- Portadown News
- Portadown News (satirical news website)
- Portuguese Navy
- Post-Newtonian expansion
- Primera Nacional
- Promissory note
- Proper noun
- Proportional navigation
- Province of Pordenone
- Provinces of Italy
- Pseudorandom noise
- Pseudorandom number sequence
- Public News (Houston)
- Purple Noon
- Pyridoxine
- West Air (China)