  We report on the Swift/XRT Deep Galactic Plane Survey discovery and
multi-wavelength follow-up observations of a new intermediate polar Cataclysmic
Variable, Swift J183920.1-045350. A 449.7 s spin period is found in Xmm-Newton
and NuSTAR data, accompanied by a 459.9 s optical period that is most likely
the synodic, or beat period, produced from a 5.6 h orbital period. The orbital
period is seen with moderate significance in independent long-baseline optical
photometry observations with ZTF and SAAO. We find that the source X-ray pulsed
fraction decreases with increasing energy. The X-ray spectra are consistent
with the presence of an Fe emission line complex with both local and
interstellar absorption. In the optical spectra, strong H$\alpha{}$, H I, He I
and He II emission lines are observed, all common features in magnetic CVs. The
source properties are thus typical of known intermediate polars, with the
exception of its estimated distance of 2.26$^{+1.93}_{-0.83}$ kpc, which is
larger than typical, extending the reach of the CV population in our Galaxy.
