PN may refer to:
Pneumonia is an inflammatory condition of the lung affecting primarily the small air sacs known as alveoli.
A pneumothorax is an abnormal collection of air in the pleural space between the lung and the chest wall.
PNC Financial Services Group, Inc. (stylized as PNC) is a bank holding company and financial services corporation based in Pittsburgh, Pennsylvania.
A pnictogen (from Ancient Greek: πνῑ́γω "to choke" and -gen) is one of the chemical elements in group 15 of the periodic table.
Pnau (), stylised as PNAU, are an Australian dance music trio originating from Sydney, Australia. The trio, a duo before 2016, consists of musicians Nick Littlemore (vocals, production), Peter Mayes (guitar, production) and Sam Littlemore (production), with Sam joining in 2016. Pnau have achieved multiple successes throughout their career with their award-winning debut album Sambanova and their widely acclaimed 2007 release Pnau.
A pneumatic motor (air motor) or compressed air engine is a type of motor which does mechanical work by expanding compressed air.
Pneumatic tubes (or capsule pipelines; also known as pneumatic tube transport or PTT) are systems that propel cylindrical containers through networks of tubes by compressed air or by partial vacuum.