The investigation of the inhibiting patterns and variations of 10cm3 leaves extracts of yam, maize and cassava on the corrosion of mild steel in a selected media using weight loss method was carried out. The mild steel samples were pre-weighed, immersed in different concentrations of NaOH, NaCl and H2SO4 solutions with the 10cm3 leaves extracts alongside the control samples immersed in solution of the media without leaves extracts. The arrangements were allowed to stand for 672 hours and a set of samples from each environment withdrawn at intervals of 168 hours for corrosion characterization. The research findings indicate that the corrosion rate decreased as a result of the 10cm3 leaves extracts introduced into the media thereby confirming that the leaves extracts functioned as effective and excellent inhibitors in the NaOH, NaCl and H2SO4 media. Among the leaves extracts from the three plants used, it was observed that Yam has the best inhibition efficiency in both NaOH (alkaline), NaCl (salt) and H2SO4 (acidic) media, followed by Cassava and Maize which also showed good inhibition efficiency. The results show the very good potentialities of the leaves extracts for application in the diminution of corrosion in our various manufacturing industries.