The apparent molar volumes of some hydrogenated and fluorinated alcohols (0.04 in) in sodium perfluorooctanoate and sodium dodecanoate aqueous solutions were determined as a function of the surfactant concentration. With the exception of hexanol in sodium dodecanoate, the apparent molar volume of alcohols in micellar solutions increases with the surfactant concentration according to the distribution of the additive between the aqueous and the micellar phases. The experimental data were rationalized by using a previously reported model for the additive distribution between the aqueous and the micellar phases which permits a simultaneous determination of the distribution constant and the partial molar volume of alcohol in the micellar and aqueous phases. When comparisons are possible, the present data are, generally, in good agreement with those reported in the literature. Information on the effect of the nature of the hydrophobic moiety of both the additive and the surfactant on the additive solubilization in micelles are obtained.