Supersymmetry Without Universality: CP Violation and Mixing in B Mesons

We study flavour physics and CP violation in the context of low energy Supersymmetry with non-universal soft mass terms for sfermions. Large deviations from Standard Model predictions are allowed in B-physics, as shown in two explicit examples. In particular, the consequences of these models for a_(J/\psi K) and Delta m_(B_s) are worked out.