The excess volumes for binary mixtures of 1-propanol or 2-propanol + benzene, + toluene, + o-xylene, + m-xylene, and + p-xylene have been measured over the entire range of composition at 298.15 K. The excess volume curves for 1-propanol + toluene, + o-xylene, and + p-xylene systems are sigmoids. For other mixtures, the V(E) values are positive over most of the concentration range, but are slightly negative at x1 > 0.8. The system 2-propanol + benzene is positive over the entire range of composition.