GU

GU can refer to:
* ".hack//G.U.", a video game series
* Gannon University, located in Erie, Pennsylvania.
* Gastric ulcer, a condition of the stomach
* Gene Upshaw, the Hall of Fame football player and longtime union leader; "GU" patches worn in his honor for the 2008-2009 football season.
* Gemeente Universiteit, a synonym for Universiteit van Amsterdam
* Georgetown University in the United States
* Glasgow University in the United Kingdom
* "Global Underground", a prominent electronic dance music compilation series
* , A Wii godzilla game
* Gonzaga University in the United States
* University of Gothenburg in Sweden ("Göteborgs universitet" in Swedish)
* Grantham University in the United States
* Griffith University in Australia
* GU Comics, an online comic.
* postal code for Guam

Gu can refer to:
* Gu (clan), Gu (family), several rare surnames of the Han Chinese people
* Gu (food), a sports nutrition product
* Gu (god), the Dahomey god of war
* Gu (surname), a last name of the Chinese and Korean people
* Gu (ward), a section of a city in South Korea

gu can be:
* a Chinese poison made from venomous animals
* the ISO 639-1 digram for the Gujarati language