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 presen
t a six-dimensional model with gauge group U (3) x U ( 3) and quarks and le
ptons accommodated in fundamental and bi-fundamental representations. The m
odel can be embedded in a D-brane configuration of type I string theory and
, upon compactification on a T-2/Z(2) orbifold, it gives rise to the standa
rd model with two Higgs doublets.