The reduction of Mn(II) on a molybdenum electrode in molten LiCl-KCl-MgCl2-MnCl2 at 898K was investigated. Cyclic voltammetry and chronopotentiometry showed that reduction of Mn(II), Mg(II) and Li(I) began at -1.14, -1.78 and -2.19V, respectively. The underpotential deposition of magnesium on pre-deposited manganese led to the formation of a liquid Mg-Mn solution, then a liquid Mg-Li-Mn solution formed for the succeeding underpotential deposition of lithium on pre-deposited Mg-Mn. The diffusion coefficient of Mn(II) in the melts was calculated, using various methods, and was found to be about 10-5cm2/s. Electrochemical Behavior of Mn(II) in the Melt LiCl-KCl-MgCl2-MnCl2. L.J.Chen, M.L.Zhang, W.Han, Y.D.Yan, P.Cao: Chemical Journal of Chinese Universities, 2012, 33[2], 327-30