NNW

NNW may refer to:


 * Neural network, an interconnected group of neurons or artificial neurons
 * North-northwest or Nor-norwest, a compass direction (one of the eight "half-winds")
 * NetNewsWire desktop news aggregator for Mac OS X
 * National Nursing Week, observed in the U.S. and Canada, incorporating International Nurses Day
 * Net national welfare, another name for Net economic welfare, a proposed national income measure
 * New native woodland, areas of reforestation created in the UK by the Woodland Trust