Elastic differential cross sections have been measured for electron-SF₆ and electron-CS₂ collisions in the energy range from 30 eV to 500 eV using a high resolution electron spectrometer. The measured cross sections have been put on an absolute scale using the relative flow technique. The total and momentum transfer cross sections have been determined by extrapolating the differential cross-section data using a least-squares fitting procedure based on standard Legendre polynomial expansion. The measured data are compared with theoretical and other experimental data wherever available. It is seen that the theoretical calculations based on independent-atom-model without polarization potential overestimates the cross sections at lower energies while at higher energies the model seems to be describing the interaction effects adequately.