The objective of this research was to identify the bacteria responsible for the degradation of tannery effluent. The tannery effluent samples were collected from the outlets of a leather industry, which is situated near Dindigul in Madurai district of Tamil Nadu, India. The microorganisms that were present in the tannery effluent were isolated by using dilution plate method. The bacteria which were able to utilised tannic acid as sole carbon source was isolated by using tannic acid amended minimal medium. The results of morphological, physiological & biochemical tests led to the identification of the bacteria to be Alcaligenes spp. This bacterium degraded tannic acid very effectively when compared to other isolated organisms. The standard graphs for tannic acid were drawn and the results were tabulated. The effect on growth and degradation of tannic acid of Alcaligenes spp. by changing different parameters were studied.