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Organic acids are the important compounds that have found numerous applications in various industries. Oxalic acid is one of the important organic acids with different industrial applications. Different microbes have been reported as important sources of various organic acids. Majority of studies have been carried on fungal sources for oxalic acid production. Aspergillus sp. has been found efficient oxalic acid producer. Microbial productions of metabolites including organic acids are considered cost effective and eco-friendly approach over chemical synthesis. Fermentative production of microbial oxalic acid seems to be a good alternative as compared to chemical methods. Microbial production of oxalic acid still requires the extensive and elaborated research for its commercial production from efficient microbes using cost effective substrates. The present text summarizes the production of oxalic acid, its applications …