  We study the observability for a lepton flavor-changing decay of a Higgs
boson $h\to \mu\tau$ at hadron colliders. Flavor-changing couplings of a Higgs
boson exist at tree level in models with multiple Higgs doublets. The
$h\mu\tau$ coupling is particularly motivated by the favorable intepretation of
$\nu_\mu-\nu_\tau$ oscillation. We find that at the Tevatron Run II the unique
$\mu\tau$ signature could serve as the Higgs discovery channel, surpassing
expectations for Higgs boson searches in the SM and in a large parameter region
of the MSSM. The sensitivity will be greatly improved at the LHC, beyond the
coverage at a muon collider Higgs factory.
