[en] In the standard model, there are four classes of CP violating hadronic asymmetries in the neutral B system which are relatively free of hadronic uncertainties. The effects of various models of new physics on these asymmetries are considered. It is found that multi-Higgs models without spontaneous CP violation, minimal supersymmetric models and left-right symmetric models have no effect on the CP asymmetries. On the other hand, the standard model predictions may be modified in the following models: four-generation models, non-minimal supersymmetric models, the three Higgs-doublet model, models with Z-mediated flavor changing neutral currents, and real superweak models