Viscosities at 298.15 K and atmospheric pressure for 12 binary (an alkoxyethanol + trichloroethylene or tetrachloroethylene) mixtures have been measured over the whole mole fraction range by an Ubbelohde viscometer. The alkoxyethanols were 2-(2-methoxyethoxy)ethanol, 2-(2-ethoxyethoxy)ethanol, 2-(2-butoxyethoxy)ethanol , 2-[2-(2-methoxyethoxy)ethoxy] ethanol, : 2-[2-(2-ethoxyethoxy)ethoxy] ethanol. and 2-[2-(2-butoxyethoxy)ethoxy] ethanol. From the experimental data, deviations in viscosity are determined and fitted to the Redlich-Kister polynomial to estimate the binary interaction parameters.