This review paper intends to provide an overall vision of SBR technology as an alternative method for treating wastewaters. This technology has been gaining popularity through the years, mainly because of its single-tank design and ease of automatation. The bibliographic review carried out here shows the efficiency and flexibility of this technology, as it is able to treat different kinds of effluents such as municipal, domestic, hypersaline, tannery, brewery, and dairy wastewaters; landfill leachates; etc.; under different conditions. The review includes relevant experiments carried out at the laboratory, pilot-plant, and industrial scales.