In this study, hyptis suaveolen L poit (HSLP) leaves extract as corrosion inhibitor on mild steel in H2SO4 solution was carried out. Gas chromatography- Mass spectrometer analysis was conducted to identify active components present in the extract. Corrosion inhibition of the plant extract on mild steel in 1M H2SO4 was evaluated using weight loss and potentiodynamic polarization methods. The weight loss method results revealed that corrosion rate decreased with increasing inhibitors concentration resulting in inhibitor efficiency of 98 %. The adsorption of hyptis suaveolen L poit leaves extract on the metal surface obeys Langmuir adsorption isotherms. Potentiodynamic polarization data indicated that hyptis suaveolen L poit leaves extract is a mixed-type corrosion inhibitor, they retarded both cathodic and anodic reactions. All the studied parameters gave good anti-corrosive properties against corrosion of mild steel in the tested solutions.