The viscosity B-coefficients of mono-, di-, tri-saccharides and the derivatives (methyl glycosides) in m(B) = (0.5, 1.0, 2.0, and 3.0) mol . kg (1) aqueous solutions of magnesium chloride have been determined from viscosity data using the Jones-Dole equation at T = (288.15, 298.15, 308.15, and 318.15) K. The viscosity B-coefficients of transfer (Delta B-t), the temperature derivatives of B-coefficients (dB/dT), pair and triplet viscometric interaction coefficients (eta(AB), eta(ABB)) have been determined. The viscosity B-coefficients data of systems studied in water have been reported earlier. The results have been interpreted in light of the solute-solute and solute-solvent interactions occurring in these systems. The comparison of results has been made with those reported in the presence of potassium chloride, ammonium sulphate, and sodium sulphate. (C) 2012 Elsevier Ltd. All rights reserved.