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Vol 7 No 2 ABSTRACT Extract of Phaleria macrocarpa leaves have been studied as corrosion inhibitor for mild steel of hydrochloric acid solution 2.0 N. The efficiency of inhibition was evaluated by gasometric method and electrochemical analysis. The temperature and concentration effects on the inhibitors performance were also investigated. The result obtained showed that the extract is one of promising candidate as an inhibitors for the corrotions of mild steel in HCl media, inhibition efficiency increase as the extract concentration is evaluated. The activation energy (Ea) increase with the addition of the extract. Where inhibition of extract on the steel surface obey modified Langmuir isotherm equation. Potentiodynamic polarization curve indicated the Phaleria macrocarpa leaves extract play role as the anodic type inhibitor. Keywords : Corrosion inhibition, mild steel, Phaleria macrocarpa, hydrochloric acid.