This study focuses on polymorphism, which is the ability of a solid to exist in multiple crystalline forms, of one organic compound called orcinol. The aim of the research is to investigate the thermodynamic relationship between the different polymorphous in a range of pressure up to 300 MPa by means of calorimetric techniques. Furthermore, X-ray diffraction measurements have been used to try to identify the crystal lattice of these polymorphs. Thermal analysis at normal pressure has revealed the existence of three distinct melting points at 108,87 °C, 97,06 °C, and 84,24 °C, corresponding to the melting of three solid phases, I, II and III, respectively.