The inhibition of corrosion of aluminium in hydrochloric acid by Jatropha tanjorensis ethanol leaf extract (JELE) and Jatropha tanjorensis acetone leaf extract (JALE) has been studied using weight loss and thermometric methods. JELE exhibited a higher inhibition efficiency than JALE at 1.0 g/L – 5.0 g/L extract concentrations studied. The inhibition efficiency by both extracts increased with increase in extract concentration. The inhibition efficiency of JELE increased with increase in temperature while that of JALE decreased with increase in temperature. The adsorption of both extracts conformed to the Langmuir adsorption isotherm. Thermodynamic data obtained revealed that the adsorption process was both endothermic and spontaneous.