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SO2 may refer to:

In science:

  • Sulfur dioxide (SO2), an oxide of sulfur, a chemical compound
  • The special orthogonal group of degree 2
  • oxygen saturation (SO2), in medicine of blood oxygenation
  • S2 (star), aka SO-2, is the name of a star near the central black hole at the center of the Milky Way galaxy that takes 16 years to orbit that black hole.
  • 2015 SO2, an Aten asteroid in a horseshoe orbit co-orbital with Earth

It may also refer to:

See also[edit]