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In the gauge-Higgs unification scenario the Higgs field is unified with gaugefields in higher dimensional gauge theory. The 4D Higgs field $H(x)$corresponds to 4D fluctuations of the Aharonov-Bohm phase (Wilson line phase)$\theta_H$ in the extra-dimension. An $SO(5)\times U(1)$ gauge-Higgsunification model in the Randall-Sundrum warped spacetime with top and bottomquarks is presented. Gauge couplings of the top quark multiplet induceelectroweak symmetry breaking by the Hosotani mechanism. The effectivepotential $V_\eff (\theta_H)$ is found to be minimized at $\theta_H = \onehalf\pi$ and the Higgs mass is predicted around 50 GeV. The $ZZH$ and $WWH$couplings vanish at $\theta_H = \onehalf \pi$ so that the LEP2 bound for theHiggs mass is evaded. The result is summarized in the effective interactionsfor $\hat \theta_H(x) = \theta_H + H(x)/f_H$.

Dynamical Electroweak Symmetry Breaking in $SO(5) \times U(1)$ Gauge-Higgs Unification in the Randall-Sundrum Warped Space