NNI may refer to: Network-to-network interface, used to interconnect signalling networks in telecommunications Net national income, a term in economics National Nanotechnology Initiative, a U.S. government cross-agency coordinating program Ngagyur Nyingma Institute, a monastic college for Buddhist studies & research Numéro national d'identification, the national identification number used in France Neural Network Intelligence, an open source AutoML toolkit for neural architecture search and hyper-parameter tuning Novo Nordisk Inc., a Danish pharmaceutical company