  We derive bounds on the Dirac Yukawa couplings of the neutrinos in seesaw
models using the recent Large Hadron Collider (LHC) data on Higgs decays for
the case where the Standard Model singlet heavy leptons needed for the seesaw
mechanism have masses in the 100 GeV range. Such scenarios with large Yukawa
couplings are natural in Inverse Seesaw models since the small neutrino mass
owes its origin to a small Majorana mass of a new set of singlet fermions.
Large Yukawas with sub-TeV mass right-handed neutrinos are also possible for
certain textures in Type-I seesaw models, so that the above bounds also apply
to them. We find that the current Higgs data from the LHC can put bounds on
both electron- and muon-type Yukawa couplings of order 10^{-2}.
