In this study, the effect of new corrosion inhibitor namely Pithecollobium Dulce (PCD) extract on the protection of mild steel (MS) in 3.5% sodium chloride (NaCl) and 1M hydrochloric acid (HCl) solutions were investigated using weight loss measurements and electrochemical techniques. Weight loss method proved that a significant decrease in the corrosion rate of MS was observed in the presence of inhibitor. Electrochemical measurements showed that the inhibition efficiencies increased with increasing inhibitor concentration. The UV-vis spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) analysis were carried out to characterize the surface film.