In order to select the most suitable solvent for the stable dispersion of Alloy 625 nanoparticles, we investigated the effects of several organic solvents on the dispersion stability. After preparing suspensions with a dispersant, we characterized the dispersion stability of the suspensions by means of visual inspection and Turbiscan transmission profiles. The dispersion stability of the solvents increased in the following order: ethyl acetate, xylene, toluene, 2-propanol, and ethanol. The polarity of the solvent affected the dispersion stability. The Alloy 625 nanoparticles were optimally dispersed in ethanol with the dispersant, Hypermer KD-2, which was stabilized by the steric effect of the dispersant.