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