USU or Usu may refer to:
- Swiss Student Union
- Universal Student Unionism (Australia)
- Unseptunium, a hypothetical chemical element with symbol Usu
- Usu (mortar), a Japanese mortar
Universities
- Universidade Santa Úrsula (Brazil)
- Utah State University (Logan, Utah)
- Ulyanovsk State University (Ulyanovsk, Russia)
- Uniformed Services University
- University of Sydney Union
- Ural State University aka Ural A.M. Gorky State University (Russia)
- United States University
- Uttarakhand Sanskrit University, a state university in Uttarakhand, India
- University of North Sumatra in Medan, Indonesia
Places
- Mount Usu, a volcanic mountain in Hokkaido, Japan
- Ushu, a mainland city that supplied the city of Tyre, called in the Amarna Letters Usu
- Wusu, a city in Xinjiang, China
- Francisco B. Reyes Airport, serving Coron and Busuanga Island, Palawan Province, Philippines (IATA code USU)
Computers
- USU Software, a German software and IT business
- USU (operating system), a Bulgarian linux distribution