Excess enthalpies for (water + monoethglethanolamine), (water + diethylethanolamine), and (water + n-propylethanolamine) have been measured at T = 298.15 II and for (water + 2-amino-2-methyl-1-propanol) at 308.15 K. Results of these measurements show some structure dependence on the excess molar enthalpies of these aqueous binary mixtures and also on the partial excess enthalpies of alkanolamines at infinite dilution in water.