SU
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Su or SU may stand for:
- the Soviet Union, former ISO country code
- a students' union
- in algebra, a special unitary group, or the corresponding Lie algebra in mathematics
- Stanford University
- Stockholm University
- Syracuse University
- the IATA code for Aeroflot
- Shut up
- su, the Unix command
- 苏, or Sū, the Jiangsu province of the People's Republic of China
- Sukhoi, the Russian aircraft company
- Sundanese, or Basa Sunda (or Wikipedia in Sundanese).
- Su, the Basque spirit of fire.