The purpose of this chapter is to appraise the current work done on the use of the yellow mealworm (Tenebrio molitor) as an alternative and sustainable protein source in poultry diets. The incorporation of insects in animal diets is regarded as an interesting topic in animal nutrition. Their popularity is expected to outstrip the current conventional feed ingredients globally. Based on nutritional analysis, yellow mealworm larvae are comparable to conventional poultry protein sources. Hence, they are widely documented as the most appropriate substitute for soybean meal and fishmeal as they have a similar influence on growth performance without having a negative impact on the carcass, meat quality, or egg quality. Therefore, this chapter will discuss the opportunity for using yellow mealworm larvae as a protein source in poultry diets. The nutritional and environmental benefits, processing and storge, and effects of Tenebrio molitor on poultry productivity are discussed.