  We examine the possibility of observing the Kaluza-Klein gluons in
gauge-Higgs unification models at the LHC with the energy sqrt{s}=14 TeV. We
consider a benchmark model with the gauge symmetry SU(3)_C x SU(3)_W in
five-dimensional space-time, where SU(3)_C is the gauge symmetry of the strong
interaction and SU(3)_W is that for the electroweak interaction and a Higgs
doublet field. It is natural in general to introduce SU(3)_C gauge symmetry in
five-dimensional space-time as well as SU(3)_W gauge symmetry in gauge-Higgs
unification models. Since the fifth dimension is compactified to S1/Z2
orbifold, there are Kaluza-Klein modes of gluons in low-energy effective theory
in four-dimensional space-time. We investigate the resonance contribution of
the first Kaluza-Klein gluon to dijet invariant mass distribution at the LHC,
and provide signal-to-noise ratios in various cases of Kaluza-Klein gluon
masses and kinematical cuts. Although the results are given in a specific
benchmark model, we discuss their application to general gauge-Higgs
unification models with Kaluza-Klein gluons. Gauge-Higgs unification models can
be verified or constrained through the physics of the strong interaction,
though they are proposed to solve the naturalness problem in electroweak
symmetry breaking.
