We identify a class of chiral models where the one-loop effective potential for Higgs scalar fields is finite without any requirement of supersymmetry. It corresponds to the case where the Higgs fields are identified with the components of a gauge field along compactified extra dimensions. We present a six-dimensional model with gauge group U (3) × U (3) and quarks and leptons accommodated in fundamental and bi-fundamental representations. The model can be embedded in a D -brane configuration of type I string theory and, upon compactification on a T 2 / 2 orbifold, it gives rise to the standard model with two Higgs doublets.
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