Jiu or JIU may refer to :
- Jiu River, a tributary of the Danube in Romania
- Jiu River (Râul Mic), a tributary of the Râul Mic in Romania
- Ţinutul Jiu, a former administrative division of Romania
- Jiu, pinyin transliteration for Chinese alcoholic beverages
- Joint Inspection Unit, a United Nations entity
- JIU, IATA code of the Jiujiang airport in Lushan province, China
- Jino language, ISO 639-3 language code
- Jones International University, a predominantly on-line school located in Centennial, Colorado