Edible insects are found in different habitats such as forests, agricultural fields and aquatic ecosystems. The practice of eating edible insects and insect based food is called entomophagy and when it is related to humans, it is called anthropo-entomophagy or human entomophagy. About one million insect species are reported and even more are yet to be documented. Insect origin is very old and evolution produces their great biodiversity. Out of million insect species, only about 5000 species are considered to be harmful. Anthropo-entomophagy is considered very primitive and taboo in many regions of the world especially in western countries, while in some regions it is widely accepted and important part of regular diets. It is estimated that anthropo-entomophagy is practiced by at least 2 billion people of the world. More than 2000 edible insects are reported in literatures. Edible insects are eaten in their all stages of life cycles viz. eggs, larvae, pupae and adults. Edible insects can provide good alternative and sustainable source of protein other than livestock protein.