A simple and sensitive electrochemical method for the quantitative determination of gallic acid (GA) using an electrochemically activated glassy carbon electrode (EAGCE) is reported. The electrochemical pre-treatment of the electrode was carried in 0.1M H2SO4 by cycling between 0.0 and 1.5 V (vs. Ag/AgCl, 3M KCl) for 10 cycles using cyclic voltammetry technique. The electrochemical properties of the suggested electrode and the voltammetric behavior of GA were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The prepared electrode EAGCE exhibited good sensitivity, selectivity and reliability in the electroanalysis of GA. Interference studies indicate that common ions (Na+ , NH4 + , Mg2+, Cu2+, Cl– , NO3 – , CO3 2– , and PO4 3– ), as well as some organic acids (ascorbic, oxalic, citric, salicylic, and tartaric acid) do not interfere with the GA assay. The proposed metal-free catalyst has cost-effective and good performance to GA determination.