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The problem of corrosion in factories and vital installations remains one of the most important obstacles that delay the progress of production and the increasing of its quantity. To solve the problem of corrosion, many inorganic and organic inhibitors have been used. Recently, inhibitors made from plant extracts, cheaper and environmentally friendly, were used. The inhibition of pumpkin seed extract on the corrosion mild steel alloy in the acidic medium was investigated using spectroscopy of the electrochemical impedance, Electrochemical technique and mass losing method with a static environmental aqueous acidic solution. Effect of inhibitor concentrations (10-50 mg/L) and immersion time (1-5 h) was studied on the inhibition efficiency (η%) of the extract on Mild Steel (MS) immersed in a 0.5 M HCl solution. All techniques showed very good matching results in the inhibition coefficient values. The optimum η% was in the range 71-76% depending on the method used. The optimum time was 5 hours. Tafel curves results showed a clear view of the extract behavior, which acts as a mixed-type inhibitor. Furthermore, the atomic force microscopy test was applied for studying surface morphology of alloy. From the foregoing, the pumpkin plant extract can be of great benefit in inhibiting corrosion in the industry. [ABSTRACT FROM AUTHOR]