Hyperon polarization in high energy reactions Qinghua Xu (Shandong University, China) In this talk, a brief overview will be given for hyperon (Lambda) polarization in high energy reactions. I will start with the transverse hyperon polarization in unpolarized hadron-hadron collisions. Then I will talk about the hyperon spin transfer in e+e-, deep inelastic scattering, and proton-proton collisions with beam(s) transversely or longitudinally polarized at high energy. Finally I will give a summary and outlook.