PPN may refer to:
- Guillermo León Valencia Airport
- Pre-Pottery Neolithic
- Nigerien Progressive Party-African Democratic Rally (Parti Progressiste Nigérien)
- Pingat Pangkuan Negara, a Malaysian honour
- Pedunculopontine nucleus
- Principal protected note, an investment contract
- Protoplanetary nebula
- Parameterized post-Newtonian formalism, for calculations on gravity
- Pacific Patriot Network
See also
edit- PPN+ or [(Ph3P)2N]+ cation, produced from Bis(triphenylphosphine)iminium chloride