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We present a multiwavelength study of the unidentified Fermi gamma-ray source0FGL J1830.3+0617, which exhibits variability above 200 MeV on timescales ofdays to weeks. Within the Fermi 95% confidence error contour lies B1827+0617, aradio source with spectral index alpha = 0.09 between 1.4 and 4.85 GHz. Theflat spectral index and flux density of 443 mJy at 4.85 GHz are consistent withthe bulk of Fermi sources associated with blazars. It is also detected in the0.3-10 keV band by Swift. Optical imaging in 2009 May identifies B1827+0617 atR ~ 16.9, and shows that it is at least 2 magnitudes brighter than on thePalomar Sky Survey plates. Contemporaneous optical spectroscopy acquired duringthis high state finds a weak emission line that we attribute to Mg II atredshift z = 0.75, supporting a flat spectrum radio quasar (FSRQ)classification. The variability characteristics and radio properties togetherindicate that 0FGL J1830.3+0617 at Galactic latitude b = 7.5 degrees is ablazar. Blazar identifications of three additional low-latitude Fermi sources,0FGL J0643.2+0858, 0FGL J1326.6-5302, and 0FGL J1328.8-5604, are alsosuggested.

0FGL J1830.3+0617: A Fermi Blazar Near the Galactic Plane