This paper introduces Five-Dimensional Orbital Field Theory (OFT), a novel framework that reinterprets the fundamental particles of the Standard Model as four-dimensional manifestations of five-dimensional fields. The central postulate of OFT is that the wave functions describing atomic orbitals are not merely probabilistic descriptions but are, in fact, low-energy solutions for the localized states of these fundamental 5D fields. We demonstrate that the three-generation structure of fermions in the Standard Model emerges naturally from the first three principal quantum levels (n=1,2,3) of these orbital fields, providing a geometric solution to the family replication problem. The theory incorporates a warped fifth dimension, akin to the Randall-Sundrum model, to address the hierarchy problem. We derive a hybrid mass-generation mechanism combining Kaluza-Klein modes with a 5D Higgs field. The theory yields a rich phenomenology, including a tower of Kaluza-Klein dark matter candidates (n≥4) and predicts specific, minute deviations in atomic energy spectra, offering avenues for falsification through both high-energy collider experiments and high-precision atomic spectroscopy.