Polycrystalline, lead free (K_0.5Na_0.5)NbO₃ and (K_0.5Na0.5)_0.49Li_0.02NbO₃ ceramics were synthesized using solid-state reaction method. X-ray diffraction studies confirmed the formation of mono-phasic ceramics. During dielectric studies some anomalies were observed around temperatures 155 ºC and 439 ºC for (K_0.5Na0.5)_0.49Li_0.02NbO₃. Complex impedance spectroscopy (CIS) technique was used to investigate the bulk (grain interior) and grain boundary contributions to the impedance as a function of temperature and frequency. CIS studies revealed that the electrical relaxation process was temperature dependent and non-Debye type. AC conductivity studies revealed that conductivity was mainly due to the ionized oxygen vacancies in (K_0.5Na0.5)_0.49Li_0.02NbO₃ ceramics.