Impaired insight in schizophrenia patients has been linked with prefrontal deficits. In this open-label study, we examined for potential insight facilitation effects of add-on tDCS (with anodal stimulation of left DLPFC and cathodal stimulation over left temporo-parietal junction) in schizophrenia patients (N = 21) with persistent auditory hallucinations despite adequate antipsychotic treatment. Following tDCS, there was a significant improvement in insight with concurrent significant reduction in auditory hallucination severity. Improvement in insight correlated significantly with improvement in severity of auditory hallucinations. These findings suggest improvement of insight with add-on tDCS in schizophrenia with persistent auditory hallucinations.