The inhibition effect of heterocyclic organic derivative viz., 2-(Benzothiazol-2-ylsulfanyl)-1-(5- methyl-thiazol-2-ylamino)-ethanol (BMTE) was evaluated against mild steel corrosion in 1 N HCl solutions using conventional weight loss method, potentiodynamic polarization, linear polarization and electrochemical impedance spectroscopy. The results of weight loss method have proved that BMTE was efficient corrosion inhibitor. Electrochemical polarizations such as Tafel Intercept and Linear Polarization Resistance revealed the mixed mode of inhibition. The results of electrochemical impedance spectroscopy have shown the changes in the impedance parameters like charge transfer resistance and double layer capacitance to confirm the strong adsorption on the mild steel surface. The increase in the value of inhibition efficiency was due to the adsorption of the molecules evaluated leading to the formation of a protective layer on the surface of mild steel. The inhibition action of these compounds was, assumed to occur via adsorption on the steel surface through the active centres contained in the molecules.