The kinetics of oxidation of phenylalanine and phenylglycine by bromine have been investigated electrochemically. Both the reactions shown to be overall of second order. The specific reaction rate for phenylalanine is 0.18 x 10² M^-1 s^-1 and 0.50 x 10² M^-1 s^-1 for the phenylglycine at 25.0^oC. The energy of activations, frequency factors and entropy of activations in case of phenylalanine and phenylglycine are found out to be 65.10 kJ mol^-1, 4.64 x 10¹² s^-1, -10.70 J K^-1 mol^-1 and 63.19 kJ mol^-1, 5.96 x 10¹² s^-1, -8.63 J K^-1 mol^-1 respectively. From results likely mechanism has been proposed.