Diabetes mellitus is a metabolic disorder characterized by hyperglycemia caused by β-cells destruction and/or insulin resistance. Okara, a byproduct of soybean, contains high amount of dietary fiber (50%), protein (25%), fat (10%), vitamins, and phytochemical components including isoflavones and soyasaponins and has drawn particular attention to its positive benefits on health as a source of fiber-rich food that can help people with diabetes. This review aimed to assemble data as a detailed summary of the health benefits of okara for the management of diabetes mellitus. This review was carried out by identifying relevant literature published from 2010 to 2023 by searching electronic databases. Okara can control diabetes by reducing body weight and delaying digestion and absorption of carbohydrates, thereby increasing satiety and decreasing blood glucose levels. To sum up, okara consumption as a functional food ingredient is beneficial in the management of diabetes.