The effect of Citrus aurantium leaf on the corrosion of carbon steel in neutral medium has been studied by mass loss measurements at different time. The present investigation revealed that the percentage of inhibition efficiency is increased with increase of inhibitor concentration and decreased with rise in period of contact. The corrosion products on the metal surface in the presence and absence of inhibitor is analysed by FTIR and UV studies. The observed results concluded that the CM leaf could serve as an effective inhibitor on carbon steel in neutral medium environment.