Densities of binary mixtures of 2,4,6,8-tetramethylcyclotetrasiloxane with benzene, toluene, o-xylene, m-xylene, and p-xylene have been determined at temperatures of (288.15, 298.15, and 308.15) K using an Anton Paar DMA 4500 oscillating u-tube densitometer. Excess molar volumes have been derived from the density data. The experimental data were satisfactorily fitted to the Redlich-Kister equation and the Legendre polynomials.