Aerobic and facultative bacteria belonging to the Enterobacteriaceae, Pseudomonadaceae, Bacillaceae, Corynebacteriaceae and Streptococcaceae families have been isolated from corroded metallic structures of a hydroelectric power unit in the Amazon region of Brazil. In addition to anamorphic dematiaceous and moniliaceous fungi, members of the archeobacteria kingdom were also detected in the same samples. Scanning electron micrographs of metal bars cultivated with consortia of the isolated microorganisms depicted suggestiveimagesofbiofilmformationandcorrodedmetallicstructuresquestioningthepossibleroleofthese microorganismsinthe corrosion activity. We also found Amazonian medicinal plants exhibiting inhibitory activity against some of the isolated microorganisms. Our new findings need additional studies to confirm the participation of some isolated microorganisms in the process of metallic degradationdespiteourmainquestionifarethereparticularmicroorganismsinvolvedinthecorrosionprocess?orif physicochemical conditions would favor the development of a particular microbiota and consequently the corrosion process would result from its metabolism?Thereforewehypothesizethatanymicroorganismcouldbepotentiallyinvolvedinthegenesisofcorrosionprocess.Thisis thefirstreportintheliteraturedealingwithmicrobiologicallyinducedcorrosionintheAmazonregionwhichisespecially characterized by its high humidity and elevated temperature all year round.