The inhibitive action of aqueous extract of tamarix gallica on the corrosion of mild steel in 1m sulphuric acid was assessed by weight-loss method and polarization technique. polarization curves revealed that the plant extract behave as mixed-type inhibitors. inhibition efficiency increased with extract concentration up to a critical value. the results show that the extract solution of the plant could serve as an effective inhibitor for the corrosion of steel in sulphuric acid medium.