The electrolyte NRTL model [C.C. Chen, L.B. Evans, AlChE J. 32 (1986) 444-454] and electrolyte Wilson model [E. Zhao, M. Yu, R.E. Sauve, M. Khoshkbarchi, Fluid Phase Equilibr. 173 (2000) 161-175] have been extended for the representation of the dynamic viscosity of strong electrolyte solutions. The models are based on Eyring's absolute rate theory and the electrolyte NRTL and Wilson models for calculating the excess Gibbs energy of activation of the viscous flow. The utility of the models is demonstrated with a successful representation of the viscosity of several electrolyte solutions at different temperatures. The results show that, the model is valid for the whole range of salt concentration and it is reliable for correlation of the viscosity of electrolyte solutions at different temperatures by only four adjustable parameters per binary system. (C) 2007 Elsevier B.V. All rights reserved.