The corrosion inhibition potentials of Strichnos spinosa L. extract was assessed using weight-loss, linear polarization resistance (LPR), SEM and Fourier transform infrared spectroscopy (FTIR) methods. Influence of extract concentrations (0.2g/l to 0.6g/l) and temperatures (303K to 323K) on corrosion and corrosion inhibition of aluminium was assessed.  The results showed that increase in concentration of the extract of Strichnos spinosa L. decreased the corrosion rate of aluminium in the hydrochloric acid media. The decrease in inhibition efficiency with increase in temperature, suggested physical adsorption of the Strichnos spinosa L extract on the aluminium surfaces. The kinetic and thermodynamic parameters calculated revealed that activation energy (E_a) for aluminium corrosion in hydrochloric acid solution increased in the presence of the plant extract and the values were found to be less than 80kJmol^-1 proposing physisorption mechanism.  Positive values of adsorption enthalpy, negative values of activation entropy and negative values of free energy show that the process is feasible and spontaneous. Linear polarization resistance curve shows that Strichnos spinosa L. extract inhibited both cathodic and anodic sites serving a mixed type inhibitor. FTIR results also showed that the inhibition mechanism was a physical type of adsorption process through the functional groups present in the extract by slight shift in absorption bands between the plant extract and that of the inhibited metal surfaces. Surface morphology also revealed that corrosion product confirmed the protection offered by the extract on the surface of the metal immersed in the acid media. The data obtained fitted well the Freundlich isotherm in relation to Langmuir isotherm tested.