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