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Background and Objective: Attention deficit hyperactivity disorder (ADHD) is a common neuropsychiatric disorder. The current pharmaceutical treatments are associated with side effects and with low efficacy so that about one third of the adults do not respond to these treatments. Transcranial direct current stimulation (tDCS) is a non-invasive and safe brain modulation technique with promising therapeutic effects on ADHD symptoms. This paper aims to comprehensively review the clinical trials of tDCS conducted in humans for the treatment of ADHD. We aim to review the clinical efficacy and mechanisms of action of the technique in ADHD treatment.