Legume seeds known to produce richer quality of proteins than cereals provide nutritious food for people around the world. Legume seeds contain around 20-40% protein. Apart from protein, it is also composed of carbohydrates, fiber, amino acids, micronutrients including several vitamins and minerals. Legume seeds can be considered a potent nutraceutical as it provides beneficial effects on human health as well as it helps in the prevention or treatment of certain diseases such as cardiovascular diseases, diabetes, digestive tract diseases, overweight, obesity, cancer, etc. Legume seeds also contain anti-nutritional compounds which may be toxic when consumed raw, but when processed and treated may play a positive role on human health. There are many more underutilized food legume seeds that may be a potential source of nutraceutical food. The main aim of this chapter is to describe the nutraceutical properties of legume seeds and their impact on human health.