Excess volumes.(VF) were measured over the entire mole fraction range for mixtures of dimethylsulphoxide with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloro-ethane, trichloroethene and tetrachloroethene at 303.15 K. The values of VF are negative for the system dimethylsulphoxide +1,1,1-trichloroethane and positive for the systems' dimethylsulphoxide + 1,2-dichloroethane, +1,1,2,2-tetrachloroethane, +trichloroethene, and tetrachloroethene. The experimental data have been interpreted on the basis of molecular interactions between unlike molecules.