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Abstract: This study presents the inhibition against corrosion for aluminum metal using extract from guava leaf as an inhibitor. The aluminum metal was placed in a 0.5M H₂SO₄ solution at 32 ± 1°C. Thermometric, gravimetric, potentiodynamic, polarization and material simulation techniques were used for the investigation. The efficiency of the inhibitor was optimized using response surface methodology (RSM). The inhibitor (guava leaf extract) was characterized using a gas chromatography-mass spectrometer. The results obtained from gravimetric and thermometric techniques show that extract from guava leaf inhibits the corrosion of aluminum in an acidic environment. An increase in the efficiency of the inhibition of the guava leaf extract examined was found to be concentration-dependent. At room temperature of 32 ± 1⁰C, an increase in the inhibitor and halide led to an increase in the efficiency of the inhibition. The inhibitor showed maximum inhibition efficiency and surface coverage of 98.41% and 0.97K respectively and a minimum corrosion rate of 0.51mm/yr. validated at the optimum conditions of inhibitor concentration of 10g/lolo + 0.4gki, medium concentration of 0.10g/l and temperature of 45^oC. A minimum efficiency of 81.61% was validated at the concentration of 2g/lolo + 0.4gki. Guava leaf extract as an inhibitor is a mixed type inhibitor based on the results of the potentiodynamic polarization thus highly effective and efficient for inhibition of corrosion in aluminum metal.