The utilization of agricultural waste to produce bioethanol proves to be an alternative energy source for the limited non renewable energy and a dependable substitute for food crops. Though the process has several challenges and limitations such as biomass transport and handling, efficient pre-treatment methods, high cost based on current technologies which results in low yield and high cost of the hydrolysis process. This review highlights different classes of agricultural waste, their sources and the processes undergone to produce bioethanol economically.