Spodoptera frugiperda is an invasive pest species in Pakistan mainly damaging the maize crop. The rearing of this pest in the laboratory is crucial as it provides insights into the biology and nutritional requirements of pests that can help develop effective pest management strategies. This study aims to provide a comprehensive understanding of the most suitable diet that can be used in the laboratory to rear Spodoptera frugiperda and its parasitism by Trichogramma chilonis and Telenomus remus. For this purpose, three artificial diets (corn, bean, chickpea) and one natural diet (maize) were evaluated along with the parasitism efficiency of Trichogramma chilonis and Telenomus remus under optimum laboratory conditions. Through the results, it is evident that immature stages of Spodoptera frugiperda had less duration in the chickpea diet (16.94 days) as compared to bean, corn, and maize, while there was no significant difference in the pre-pupal, pupal, and adult durations among all diets. On the other hand, the overall survival rate was highest in the corn diet while the corn-based diet showed the best results regarding fecundity (1283 eggs) as compared to the bean-based diet (863 eggs). In the case of parasitism efficiency, all the diets with 48 hrs of exposure of the eggs to T. remus and T. chilonis had more parasitism than after 24 hrs of exposure. Upon comparing the results, T. remus exhibited the highest parasitism efficiency of 91.5 and 92.3%, respectively, against eggs obtained from the bean and natural diet, while T. chilonis recorded the highest parasitism against the eggs of S. frugiperda reared on chickpea and natural diets (70.2 and 65.9%). From the results, it can be concluded that chickpea was the most suitable diet for the rearing of S. frugiperda, while the least compatible diet was a bean-based diet.