Using a quantum chemical method developed for crystalline systems and a periodic large unit cell (LUC) model, ethanol, CH₃CH₂OH, adsorption on the SrTiO₃ (001) surfaces is studied, considering both cubic and tetragonal lattices of the crystal. The investigation is carried out for the ethanol molecule as a whole complex and considering its decomposition into the ethylene and water. The structural and electronic effects involved in the adsorption are discussed. The obtained results predict a higher possibility of ethanol adsorption on the Ti-O₂ face of the SrTiO₃ (001) surfaces for both crystallographic lattices. The favored ethanol adsorption as a whole complex testifies the possibility of the ethanol molecule formation from the ethylene and water on the SrTiO₃ (001) surface with the former acting as a catalyst.