SO3 may refer to:
- Sulfur trioxide, a chemical compound of sulfur and oxygen. Sulfur trioxide (also spelled sulphur trioxide) is the chemical compound with the formula SO3
- SO(3), the special orthogonal group in 3 dimensions; the rotations that can be given an object in 3-space. This article is about rotations in three-dimensional Euclidean space
- Star Ocean: Till the End of Time, the third main game in the Star Ocean series. is the third main game in the Star Ocean Video game series The game was developed by Tri-Ace and published by Square Enix for the PlayStation
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