SU2 may refer to:
- SU(2), the 2-dimensional special unitary group in mathematics
- SU-2, a scout version of the Vought O2U Corsair biplane
- SU2 code, a suite of open-source software tools written in C++ for the numerical solution of partial differential equations
- Sukhoi Su-2, a Soviet reconnaissance and light bomber aircraft used in the early stages of World War II