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Due to its long half-life of 1.5 Myr, the isotope $^{60}$Fe is expected to accumulate in the interstellar medium, and the $\gamma$-ray lines from the decay of its daughter $^{60}$Co are expected to be emitted in a diffuse glow from the Galactic plane. We have searched for the $^{60}$Fe lines at 1.17 and 1.33 MeV in the combined OSSE spectra obtained from the central radian of the Galactic plane during the first two years of the Compton Observatory\/ mission. We will present the preliminary results of this search.