  The $SO(11)$ gauge-Higgs grand unification in the Randall-Sundrum warped
space is presented. The 4D Higgs field is identified as the zero mode of the
fifth dimensional component of the gauge potentials, or as the fluctuation mode
of the Aharonov-Bohm phase $\theta_H$ along the fifth dimension. Fermions are
introduced in the bulk in the spinor and vector representations of $SO(11)$.
$SO(11)$ is broken to $SO(4) \times SO(6)$ by the orbifold boundary conditions,
which is broken to $SU(2)_L \times U(1)_Y \times SU(3)_C$ by a brane scalar.
Evaluating the effective potential $V_{\rm eff} (\theta_H)$, we show that the
electroweak symmetry is dynamically broken to $U(1)_{\rm EM}$. The quark-lepton
masses are generated by the Hosotani mechanism and brane interactions, with
which the observed mass spectrum is reproduced. The proton decay is forbidden
thanks to the new fermion number conservation. It is pointed out that there
appear light exotic fermions. The Higgs boson mass is determined with the
quark-lepton masses given, which, however, turns out smaller than the observed
value.
