  The prospects for discovering Higgs particles and studying their fundamental
properties at future high-energy electron-positron and hadron colliders are
reviewed. Both the Standard Model Higgs boson and the Higgs particles of its
minimal supersymmetric extension are discussed. We update various results by
taking into account the new value of the top quark mass obtained by the CDF
Collaboration and by including radiative corrections some of which have been
calculated only recently.
