SU

SU may refer to: wiktionarypar|su
* Su (Basque), the Basque spirit of fire
* su (Unix), the "substitute user" command
* Su (surname), a Chinese surname
* su-, the Sanskrit cognate of Greek εὖ
* Seismic Unix, a collection of seismic data processing tools
* Su, a village in Laming, Cambodia
* Su (Shugo Chara!), a fictional character in the manga series "Shugo Chara!"

Abbreviations:
* Aeroflot, Russian airline (IATA code SU)
* Jiangsu (Sū, 苏), province of the People's Republic of China
* Sabancı University
* Salisbury University
* Samokhodnaya ustanovka, Soviet self-propelled guns
* Scripture Union, a Christian organisation
* Seattle University
* Seton Hall University
* Shippensburg University
* Shut up
* Silliman University
* Silpakorn University
* Sinclair User magazine
* Sofia University
* Soft updates, an approach to maintaining computer disk integrity after an interruption
* Sonic Underground, a cartoon
* Sonic Unleashed, an upcoming Sonic video game
* Sosialistisk Ungdom
* South University
* Soviet Union (former ISO country code SU)
* Special unitary group in algebra, SU(n)
* Stanford University
* Statistical Unit
* Stellenbosch University
* Stockholm University
* Students' union
* StumbleUpon, a web discovery service
* SU carburetor (Skinners Union)
* Subscriber unit
* Sukhoi, Russian aircraft company
* Sulfonylurea, a drug for treating Diabetes
* Sun unit, a unit of sunlight intensity
* Sundanese Language
* Super Ubuntu, an operating system based on Ubuntu
* SuperUser, a privileged computer user account
* Syracuse University
* .su, country code top-level domain for the Soviet Union
* Unit of long distance measurement in the show "Battlestar Galactica" similar to a light-year