SU, Su or su may refer to:

In geography:

  • Su, Cambodia, a village in Laming, Cambodia
  • Jiangsu (Sū, 苏), province of the People's Republic of China
  • Soviet Union (former ISO country code) and its country-code TLD .su
  • Subotica, a city in Serbia (license plate code)

in computing:

  • su (Unix), the substitute user command
  • Seismic Unix, a collection of seismic data processing tools
  • SuperUser, a privileged computer user account
  • .su, country code top-level domain for the Soviet Union

several units:

  • Statistical Unit
  • Subscriber unit
  • Sun unit, a unit of sunlight intensity
  • a unit of long distance measurement in the show Battlestar Galactica similar to a light-year

in aviation:

  • Aeroflot, a Russian airline (IATA code)
  • Vought SU, a US Navy Scout aircraft
  • Sukhoi, a Russian aircraft company

the following organizations:

  • Scripture Union, a Christian organisation
  • Socialist Youth (Norway), a Norwegian youth league
  • Students' union
  • SU carburetor (Skinners Union)

SU may also refer to the following universities:

  • Sabancı University in Istanbul, Turkey
  • Salisbury University in Salisbury, Maryland, United States
  • Seattle University in Seattle, Washington, United States
  • Seton Hall University in South Orange, New Jersey, United States
  • Sheffield University in Sheffield, South Yorkshire, United Kingdom
  • Shenandoah University in Winchester, Virginia, United States
  • Shippensburg University of Pennsylvania in Shippensburg, Pennsylvania, United States
  • Silliman University in Dumaguete City, Negros Oriental, Philippines
  • Silpakorn University in Bangkok, Thailand
  • Singularity University in California, United States
  • Sofia University in Sofia, Bulgaria
  • South University in Savannah, Georgia, United States
  • Southern University in Baton Rouge, Louisiana, United States
  • Southwestern University in Georgetown, Texas, United States
  • Staffordshire University in Staffordshire, United Kingdom
  • Stanford University in Stanford, California, United States
  • Stellenbosch University in Stellenbosch, South Africa
  • Stevenson University in Stevenson and Owings Mills, Maryland, United States
  • Stockholm University in Stockholm, Sweden
  • Syracuse University in Syracuse, New York, United States

other uses:

  • Su (Basque), the Basque spirit of fire
  • Su (kana), す or ス, Japanese kana
  • Su (surname), a Chinese surname
  • su-, the Sanskrit cognate of Greek εὖ
  • Su (Shugo Chara!), a fictional character in the manga series Shugo Chara!
  • Samokhodnaya ustanovka (disambiguation)
  • Sinclair User, a magazine
  • Special unitary group, a term used in algebra, SU(n)
  • Statens Uddanneslsesstøtte, a government grant for students in Denmark
  • StumbleUpon, a web discovery service
  • Sulfonylurea, a drug for treating Diabetes
  • Sundanese Language
  • SuperUser, a computer Q&A site