Densities, rho, and viscosities, eta, for ternary liquid mixtures of tetrahydrofuran (1) + 1-chlorobutane(2)+ 1-butanol (3) have been measured as a function of composition at temperatures of 283.15, 298.15 and 313.15 K and atmospheric pressure over the full range of composition. From theses results excess molar volume, V-E, viscosity deviations, Deltaeta, from mole fraction average, and excess free energies of activation of viscous flow, DeltaG*(E), have been calculated. Excess molar volume, viscosity deviations and excess free energies of activation of viscous flow were fitted to Cibulka, Singh and Nagata equations. The results are discussed in terms of the molecular interaction between the components of the mixtures. Excess molar volumes and deviations of the viscosities for this ternary system were predicted from binary contributions using geometrical solution models, Tsao-Smith, Jacob-Fitzner, Kholer, Rastogi and Radojkovic. Additionally, experimental results are compared with those obtained by applying group-contribution method proposed by Wu. (C) 2003 Elsevier Science B.V. All rights reserved.