UDG may refer to:
Universities
- University of Girona, a university located in the city of Girona, Spain.
- University of Granma, a university located in Bayamo, Cuba.
- University of Guadalajara, a university located in the city of Guadalajara, Mexico
- University of Donja Gorica, a university located in the city of Podgorica, Montenegro
Science
- Uracil-DNA glycosylase, an enzyme which excises uracils from DNA
- Double-stranded uracil-DNA glycosylase, an enzyme
- Ultra diffuse galaxy
- Unit disk graph from geometric graph theory
Others
- udg, the ISO 639-3 code for the Muduga language
- UDG (band), Czech pop rock band from town Ústí nad Labem.
- UTMC Development Group, a UK local authority led UTMC management group
- User-defined graphic: on early home computers, a small graphic created by the user and added to the character set.
- Danganronpa Another Episode: Ultra Despair Girls
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