The present work is concerned with a thermodynamic study of benzimidazole (general formula : C7H6N2) It was achieved using four techniques : combustion calorimetry of small amounts of substance (a few milligrams), sublimation calorimetry, differential thermal analysis and heat capacity measurements. From this study, it was possible : to determine the enthalpies of combustion, sublimation and fusion of this compound as well as its triple point temperature; to determine the experimental resonance energy and to compare it with the theoretical value; to determine the atomization enthalpy and to compare it with the value calculated from the energetical contributions of the intramolecular bonds; and to determine the intermolecular enthalpy bonds.