  Additional U(1) gauge symmetries and corresponding vector bosons, called
hidden photons, interacting with the regular photon via kinetic mixing are well
motivated in extensions of the Standard Model. Such extensions often exhibit
extra spatial dimensions. In this note we investigate the effects of hidden
photons living in extra dimensions. In four dimensions such a hidden photon is
only detectable if it has a mass or if there exists additional matter charged
under it. We note that in extra dimensions suitable masses for hidden photons
are automatically present in form of the Kaluza-Klein tower.
