By means of a vibrating tube densimeter, the excess molar volumes V-E at 298.15 K have been determined in the whole composition domain for the ternary system ethanol + tetrahydrofuran + cyclohexane and for the relevant binary mixtures. While ethanol + tetrahydrofuran shows slight V-E values and a S-shaped V-E curve, the other two binaries have similar largely positive V(E)s. The ternary V-E surface is almost always positive with a small maximum. The binary V-E data have been described with different correlation equations. The capabilities of different models of either predicting or reproducing the ternary data have been compared. The behaviour of V-E and of the partial molar excess volumes of the components in the ternary system is discussed and it is found that hydrogen-bonding decreases with alcohol dilution and increases with the tetrahydrofuran solution content.