Viscosities and densities of ternary systems of MgCl(2)-NaCl-water were measured in the range of (298.15 to 318.15) K at 5 K intervals and up to 6 mol.kg(-1). The experimental viscosity data were satisfactorily correlated as a function of concentration using the extended Jones-Dole equation. The optimized parameters showed that the presence of MgCl(2) had a prevailing effect on the viscosity of the ternary solutions rather than NaCl. The dependency of the optimized parameters of the viscosity correlation on temperature was also investigated. The average absolute deviation between the calculated and the experimental viscosities was below 2.2 %.