  I present a class of hidden sector dark matter (DM) models with local dark
gauge symmetries, where DM is stable due to unbroken local dark gauge symmetry,
or due topology, or it is long-lived because of some accidental symme- tries,
and the particle contents and their dynamics are completely fixed by local
gauge symmetries. In these models, one have two types of natural force
mediators, dark gauge bosons and dark Higgs boson, which would affect DM and
Higgs phenomenology in important ways. I discuss various phenomenological
issues including the GeV scale gamma-ray excess from the galactic center (GC),
(in)direct detection signatures, dark radiation, Higgs phenomenology and Higgs
inflation assisted by dark Higgs.
