  We investigate viable scenarios with various axions in the context of
supersymmetric field theory and in globally consistent D-brane models. The
Peccei-Quinn symmetry is associated with an anomalous U(1) symmetry, which
acquires mass at the string scale but remains as a perturbative global symmetry
at low energies. The origin of the scalar Higgs-axion potential from F-, D- and
soft breaking terms is derived, and two Standard Model examples of global
intersecting D6-brane models in Type II orientifolds are presented, which
differ in the realisation of the Higgs sector and in the hidden sector, the
latter of which is of particluar importance for the soft supersymmetry breaking
terms.
