NNT

NNT could refer to:


 * Nan Airport, Thailand; IATA airport code NNT
 * The Nakai–Nam Theun National Biodiversity Conservation Area in Laos
 * Nassim Nicholas Taleb
 * Number needed to treat, an epidemiological measure
 * Nunthorpe railway station, England; National Rail station code NNT
 * NAD(P) transhydrogenase, a human mitochondria|mitochondrial enzyme encoded by the NNT gene