Electrochemical surface nitriding of TiHx electrodes in alpha-, beta-, and delta -phase states were conducted in LiCl-KCl-Li3N melts at 723 K. From X-ray photoelectron spectroscopy and X-ray diffraction analysis of their surfaces, the effect of absorbed hydrogen on the nitriding process was evaluated. Both atomic ratio of nitrogen and thickness of the formed nitride layer increased considerably for the TiHx electrodes in comparison with the pure titanium electrode. This suggests that the absorbed hydrogen in the titanium electrode affects electrochemical nitride formation and accelerates its growth.