Experimental excess enthalpy, excess volume, and density data for the binary liquid mixtures pyridine + n-methyldiethanolamine (MDEA) and pyridine + monoethanolamine (MEA) are reported at atmospheric pressure and (15, 25, and 80) degrees C. Experimental data are not currently available for these mixtures, and the reported values are particularly important for the ongoing development of group-contribution based thermodynamic models linked to the impact of specific molecular features on molecular interactions in mixtures and improving the parametrization of equation of state models. The experimental methods and procedures and data processing methods were validated using the heptane + toluene binary mixture, where it was possible to compare experimental and computational results obtained with literature values. Mixture liquid density, excess volume, and excess enthalpy data are also compared with values computed using the Peng-Robinson equation of state.