  We review the collider phenomenology of neutrino physics and the synergetic
aspects at energy, intensity and cosmic frontiers to test the new physics
behind the neutrino mass mechanism. In particular, we focus on seesaw models
within the minimal setup as well as with extended gauge and/or Higgs sectors,
and on supersymmetric neutrino mass models with seesaw mechanism and with
$R$-parity violation. In the simplest Type-I seesaw scenario with sterile
neutrinos, we summarize and update the current experimental constraints on the
sterile neutrino mass and its mixing with the active neutrinos. We also discuss
the future experimental prospects of testing the seesaw mechanism at colliders
and in related low-energy searches for rare processes, such as lepton flavor
violation and neutrinoless double beta decay. The implications of the discovery
of lepton number violation at the LHC for leptogenesis are also studied.
