The poly (glycine) modified carbon paste electrode (MCPE) was fabricated for the determination of catechol and hydroquinone by cyclic voltammetric and differential pulse voltammetric techniques. The poly (glycine) MCPE exhibits high sensitivity and selectivity in the determination of catechol and hydroquinone in a binary mixture. The effect of scan rate was examined and it was found to be adsorption-controlled. The effect of concentration was studied in the range of 20-180 mu M. The limit of detection (3S/M) and limit of quantification (10S/M) for CC were found to be 0.16 mu M and 0.55 mu M, respectively and for HQ the values were 0.20 mu M and 0.66 mu M, respectively. In order to show the selectivity of the electrode interference study was performed by varying the concentration of one analyte while keeping another analyte constant. Overall, a simple experimental procedure for fabricating the poly (glycine) MCPE was proposed with the merits of sensitivity, selectivity, reproducibility, and anti-fouling property towards the electroactive species and also in biological matrices.