Excess molar enthalpies of cyclopentanol and cyclohexanol in mixtures with n-hexane, n-dodecane or n-hexadecane have been determined at 298.65 and 308.65 K, and at pressures up to 10 MPa. The H(m)E values are positive over the entire mole fraction range, and increase with increasing temperature and chain length of the n-alkane, but decrease with increasing pressure. The dependence of H(m)E on the size and shape of the component molecules is discussed.