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This article presents data on the evaluation of Stylosanthes gracilis extract as corrosion inhibitor for 304 L in H₂SO₄ solution. The data were obtained from weight loss measurements, energy dispersive spectroscopy and X-ray diffraction studies. The extract reduced the rate of corrosion on SS 304l in H₂SO₄ solution at an optimum concentration of 1.2 g/L with inhibition efficiency of about 87.81% and corresponding surface coverage of 0.878. The corrosion rate of 0.232 mm/yr was observed in the inhibited sulphuric acid as against 1.904 mm/yr in the blank acid respectively at 240 h of exposure of the specimens. At 2400 h of exposure, the observed corrosion rate was 0.228 mm/yr with an efficiency of 74.21%. Whereas the extract's efficacy was slightly influenced by time, concentration has a profound effect on the extract's protection capability. The decrease in the efficiency of the extract after 2400 h is 13.6 …