The influence of Wrightia tinctoria leaves toward the corrosion of brass in 1.0N HCl was investigated by using mass loss measurement with various period of contact and temperature. The observed results suggest that the percentage of inhibition efficiency is enhanced with increase of inhibitor concentration and temperature. When the temperature increases the % of inhibition efficiency also increases may reveals that the adsorption of inhibitor on the metal surface takes place through chemisorptions process. The thermodynamic parameter such as Ea, ∆S, Qads ∆Hads and ∆Gads suggests that the adsorption may be exothermic and spontaneous process. It was found out that the adsorption of WTL inhibitor follows Langmuir adsorption isotherm. The corrosion product may also be confirmed by the spectral studies such as UV, FT-IR, and the film formation by SEM image.