The high-statistics data samples from the BABAR and Belle B-Factory experiments provide stringent constraints on charged Higgs bosons within the context of specific New Physics models. These constraints are obtained by comparing Standard Model predictions with experimental observations in rare B decays with potential sensitivity to contributions mediated by a virtual H +/- in tree or loop diagrams. Recent experimental results on the decays B+ to micro + v, B+ to tau + nu and inclusive B to Xs gamma are described and the implications of these measurements for charged Higgs bosons is discussed. Show Partial Abstract