TNU may refer to:
Tajik National University Tavrida National V.I. Vernadsky University, Ukraine Televisión Nacional Uruguay Tianjin Normal University, China Thái Nguyên University, Vietnam Trevecca Nazarene University, United States Tungnan University, Taiwan Newton Municipal Airport (Iowa), with IATA, FAA LIT codes:TNU Terrestrial Neutrino Units, a measurement of geoneutrinos