  We study LHC Higgs signatures from topflavor seesaw realization of
electroweak symmetry breaking with a minimal gauge extension SU(2) x SU(2) x
U(1). This elegant renormalizable construction singles out top quark sector
(instead of all other light fermions) to join the new SU(2) gauge force. It
predicts extra vector-like spectator quarks (T, B), new gauge bosons (W', Z'),
and a pair of neutral Higgs bosons (h, H). We demonstrate that for the lighter
Higgs boson h of mass 125GeV, this model predicts modified Higgs signal rates
in h --> \gamma\gamma, WW*, ZZ* channels via gluon fusions, in h --> tau tau
mode via vector boson fusions, and in h --> bb mode via gauge boson associate
productions. We perform a global fit for our theory by including both direct
search data (LHC and Tevatron) and indirect precision constraints. We further
analyze the LHC discovery potential for detecting the heavier Higgs state H.
