  CP violations in B meson decays at hadron colliders are reviewed. In
particular I examine: $B^0-\bar{B^0}$ mixing and oscillations within Standard
Model and the Cabibbo-Kobayashi-Maskawa picture for CP violations; $B^0$ decays
into CP eigenstates and the measurements of the angles in the unitarity
triangle; finally I consider a class of charged $B$ decays that allow to avoid
uncertainties arising from the computation of hadronic matrix elements.
