SUS or Sus can refer to:
- SUS
- Saybolt Universal Second, unit of viscosity
- Scottish Universities Sport, a professional body for university sport
- Services for the UnderServed, a nonprofit organization working with the mentally disabled in New York City
- Sharnbrook Upper School and Community College, Bedfordshire, England
- Single UNIX Specification, a group of computer standards
- Sistema Único de Saúde, Brazil's publicly funded health care system
- Society of University Surgeons
- Software Update Services, a software updating tool from Microsoft
- IATA code for Spirit of St. Louis Airport in St. Louis, Missouri, USA
- Steel Use Stainless, or Stainless Steel
- State University System of Florida
- Stavanger Universitetssykehus (Stavanger University Hospital) in Stavanger, Norway
- Stochastic universal sampling
- Systems Universalisation Specialist, a unit of the Russian army
- System Usability Scale, a scale for usability in systems engineering
- Sus
- Sus, the genus containing pigs
- Sus, Azerbaijan, a village
- Sus, Iran, a village
- Sus, Pyrénées-Atlantiques, France
- Suspended chord, in music
- Sus law, formerly allowing broad powers to the police in Britain to stop and search
- Sus (film), a 2010 British film