Excess volumes, excess viscosities and excess energies of activation for viscous flow have been determined at 298.15 K and 313.15 K by means of density and viscosity measurements for the binary mixtures of a halogenated (Br, Cl) benzene or cyclohexane with 1-butanol. The results show the influence of both the type of cyclic system and the halogen atom. At 298.15 K, the mixtures with aromatic derivatives present negative values ofVEin a wide composition range mainly corresponding to the zone rich in 1-butanol. This region diminishes at 313.15 K. The values for ηEandG*Eare negative for all mixtures at two temperatures.