UNN

Unn may refer to:
 * Unn Ketilsdatter, known as Aud the Deep-Minded
 * Unn (Bhiwani), a village in the Indian state of Haryana
 * Unnilnilium, the former placeholder name for Fermium

UNN may stand for:
 * The University of Nigeria, Nsukka, Nigeria
 * The University of Northumbria at Newcastle, now Northumbria University, in England
 * Ranong Airport (IATA airport code)
 * Unnilnilium (Unn), another name for the chemical element Fermium
 * N. I. Lobachevsky State University of Nizhny Novgorod, in Russia
 * University Hospital of North Norway
 * Ulagathilaye Nallavan Naandaan is a well-accepted term in the world referring to Nandu
 * Unified National Nominate, fictional government in the 1999 survival horror game System Shock 2
 * Union railway station, Melbourne