The excess molar enthalpies, H-m(E) of pentan-2-one or pentan-3-one + methanol, ethanol, propan-1-ol, or propan-2-ol were measured over the whole composition range at the temperature 298.15 K and atmospheric pressure. These results, together with results from the literature, are discussed in terms of the ketone and alkanol carbon numbers and the position of the OH group on the alkanol.