The search for Higgs bosons is one of the most important motivations for
future linear e+e- and photon colliders. In this talk the major aspects
of Higgs physics of the Standard Model and its extensions at these two
collider types will be reviewed. In particular the measurements of Higgs
masses, quantum numbers and couplings via their production and decay
processes at a linear e+e- collider will be sortly summarized. Ongoing
developments of Higgs boson production via gamma-gamma and tau+ tau-
fusion and their impact on coupling and parameter measurements will be
discussed in detail.