NNP abbreviation for 1. (Economics) net national product 2. (Government, Politics & Diplomacy) (in South Africa) New National Party Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014