The human gut microbiota fosters the development of a dynamic group of microorganisms impacted by diverse variables that include genetics, diet, infection, stress, ingested drugs, such as antibiotics and small intestine bacterial overgrowth (SIBO) as well as the gut microbiota itself. These factors may influence the change in microbial composition, which results in dysbiosis (microbial imbalance) and exposes the gut to pathogenic insults. Dysbiosis is incidental to the etiology of inflammatory diseases such as irritable bowel syndrome (IBS) and metabolic diseases, including type 2 diabetes and obesity. IBS exhibits different symptoms like abdominal pain or discomfort, distention/bloating, and flatulence. To treat IBS, modification of dysregulated gut microbiota can be done using treatment strategies like a low-fermentable oligosaccharides, disaccharides, monosaccharides, and polyols (FODMAP) diet, antibiotics that cannot be absorbed like rifaximin and neomycin, probiotics and prebiotics, and fecal microbiota transplantation (FMT). The remedial modalities in the existing literature have been demonstrated to be efficacious in the prevention and mitigation of IBS. Additionally, newer curative approaches with serum-derived bovine immunoglobulin (SBI) are an effective option. The focal point of the review paper is the pathophysiology of IBS, mainly due to dysbiosis and the various factors that advance dysbiosis. Here, we have also discussed the different treatment strategies targeting dysbiosis that effectively treat IBS. How to cite this article: Abraham P, Pratap N. Dysbiosis in Irritable Bowel Syndrome. J Assoc Physicians India 2023;71(9):75-81.