In this study, the Au-T3T modified electrode was prepared by coating the surface of gold (Au) electrode with 1H-1, 2, 4-triazole-3-thiol (T3T). Deposition of T3T was performed by cyclic voltammetry scanning from -0.8 V to +1.5 Vat a sweep rate of 100 mV s-1 for 30 cycles in 1 mM T3T solution. The electrochemical behavior of phenol (Ph) was investigated by using voltammetry (CV) and differential pulse voltammetry (DPV) techniques on the Au-T3T electrode surface and voltammetric determination was performed. Optimum working conditions such as supporting electrolyte and its pH value, which are suitable for determination of Ph have been determined by Au-T3T electrode. The suitable support electrolyte was determined to be pH 1.0 HC1O4 solution. By modifying the Au electrode surface with T3T, it was determined that the current value of the oxidation peak of the phenol increased by 3.41 times. The calibration curve and limit of detection (LOD) were obtained in the range of 1.0 x10(-7) - 3.6 x10(-5) M and 1.2 x10(-8) Mon the Au-T3T modified electrode, respectively. The Au-T3T electrode has been seen to have good repeatability, stability, and selectivity in the determination of Ph. Determination of Ph on the Au-T3T modified electrode was performed with low standard deviation (BSS) and good recovery values using standard addition method in tap water.