The beauty of SUSY

B physics represents a privileged place to look for supersymmetry (SUSY) through its virtual effects. Here we discuss rare B decays (b → sγ, b → sg, b → sℓ+ℓ−) and B-B̄ oscillations in the context of low-energy SUSY. We outline the variety of predictions that arise according to the choice of the SUSY extension ranging from what we call the “minimal” version of the MSSM to models without flavour universality or with broken R-parity. In particular, we provide a model-independent parameterization of the SUSY FCNC effects which is useful in tackling the problem in generic low-energy SUSY. We show how rare B physics may be complementary to direct SUSY searches at colliders, in particular concerning extensions of the most restrictive version of the MSSM.