UDN
# UDN

UDN can stand for:

* National Democratic Union (Brazil) (União Democrática Nacional),a political party that existed in Brazil between 1945 and 1965
* Univision Deportes Network, a Spanish-language sports channel in the United States
* Ulcerative dermal necrosis, a disease of salmon and trout
* United Daily News, a Taiwanese newspaper
* IATA airport code for Codroipo civil airport in Italy
* Unique Device Name of the UPnP Device Architecture
* Undiagnosed Diseases Network, an NIH-funded study of intractable medical conditions that have eluded diagnosis
* University of Da Nang, a public university system in Vietnam
