PPN

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