This paper reports excess molar enthalpies. H-m(E), for the binary mixtures of {1-alkanols (2), namely, (methanol, ethanol, I-propanol, 1-butanol. and 1-pentanol) with benzaldehyde (1)} at T = 298.15 K at ambient pressure over a whole range of mole fraction. The sign of H-m(E) for all systems are positive and the magnitude of K, values with increasing of chain length, increase. The Redlich-Kister polynomial equation was used to correlate H. The excess partial molar enthalpies of benzaldehyde, H-m,1(E), excess partial molar enthalpies of 1-alkanols (C-1 to C-5). H-m.2(E), and excess partial molar enthalpies at infinite dilution, H-m.i(E.0), are calculated according to experimental excess molar enthalpies and Redlich-Kister polynomial equation. The extracted date were used to evaluated the so-called intermolecular interaction functions partial derivative H-m.i(E)/partial derivative X-i and partial derivative H-m,i(E)/partial derivative X-j in terms of enthalpy. The ERAS, Wilson and NRTL models have been applied for describing the H-m(E). (C) 2011 Elsevier Ltd. All rights reserved.