Electrolytic removal of Se (VI) in waste water (15 ppm) is studied at pH 1 and 3 and at room temperature. Prior to electrolysis, there was a drop in concentration due to adsorption of Se onto activated carbon. In the initial half of electrolysis, the decrease in residual concentration followed the nucleation growth reaction without an increase in Se (IV). In the later half, plots were scattered, due to desorption of Se. The reaction has a maximum of removal rate; this was in accordance with those of data. Current efficiency was about 3 % at the maximum, owing to generation of hydrogen. The current density for particles suspended is compared with those for suspension electrolyses of the S-Cu system.