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, mitochondrial, a human enzyme encoded by the NNT gene