In this experimental, the densities of monoethanolamine (MEA) + alcohol binary mixtures were measured at temperatures from (293.15 to 333.15) K at 0.1 MPa. The studied alcohols include straightchain ones, ethanol, n-propanol and n-butanol, and branched-chain ones, isopropanol, isobutanol and tertbutanol. From the experimental density values, we calculated the molar volume (V-m), the thermal expansion coefficient (alpha(p)) and excess molar volume (V-m(E)). The V-m(E) values for the six binary systems are all negative ranging from (-1.020 to -0.064) cm(3).mol (1). For straight-chain alcohol mixtures, the V-m(E) values follow the increasing order of ethanol < n-propanol < n-butanol. And for the branched-chain alcohol mixtures, the V-m(E) values follow the increasing sequence of tertbutanol < isobutanol < n-butanol. All these result from the intermolecular interactions and structural characteristics. For smaller ethanol molecule and MEA, the molar volume is quite similar to each other. However, V-m(E) value for ethanol + MEA system is the most negative. Therefore, the formation of hydrogen bonds plays a leading role for excess molar volume in small molecule alcohol systems. On the other hand, for larger butanol molecule + MEA systems, steric effect leads to a decrease in excess molar volume with the increase in butanol molar volume. Furthermore, the V-m(E) values were correlated with Redlich-Kister polynomial equation with the largest deviation of 0.048. (C) 2019 Elsevier Ltd.