Eugenol is the major component of clove and clove-based products which is widely used in food and pharmaceutical industry and medicine. Its content can be considered as a marker of the sample quality. Therefore, simple, sensitive, and reliable methods for eugenol quantification is required. Glassy carbon electrode modified with carboxylated multi-walled carbon nanotubes and electropolymerized pyrogallol red has been developed for the determination of eugenol in essential oils. The working conditions (supporting electrolyte, pH, monomer concentration and electrolysis parameters) of pyrogallol red have been found using voltammetric characteristics of eugenol. Electrode developed has been studied using scanning electron microscopy, voltammetry and electrochemical impedance spectroscopy. The effectivity of the electrode surface modification has been proved. Eugenol determination has been performed in differential pulse mode which parameters have been optimized. The linear response of the electrode towards eugenol has been obtained in the range of 0.75-100 µM with the detection limit of 0.73 µM. High selectivity of eugenol determination has been observed in the presence of typical inorganic and organic compounds including essential oils components. The approach developed has been tested on the commercial clove, cinnamon, and nutmeg essential oils. Validation with the independent method has shown similar accuracy and the absence of systematic errors of eugenol determination.