In this paper, effects of high voltage transmission line electric fields on biological systems especially on a grounded human body standing under a high voltage transmission line are studied. The distribution of electric field and induced currents on a human body standing underneath a high voltage overhead transmission line is computed. Electric field distribution around a three phase 380 kV transmission line is computed by using Charge Simulation Method. Induced currents on the human body are obtained using computed electric field values. Computed induced currents are evaluated with respect to safe limits. It is found that these currents are below the dangerous limits.