Insects are the most dominant and successful group in the animal kingdom. This may be due to their highly active defense system, which protects them from various biotic and abiotic factors. Besides these, most insects maintain mutualistic relationships with certain microbes that reside in their bodies, known as endosymbionts. These microbes play vital roles ranging from nutritional supplementation to defense against both abiotic and biotic factors. Endosymbionts are primarily categorized into two types: primary and secondary. Primary endosymbionts are vertically transmitted from mother to offspring, and their roles are considered critical for the nutrition, survival, and development of the host. Most of the obligatory symbionts cannot be cultured on artificial media. Even culturing or isolating the culturable endosymbionts presents a significant challenge. The technique proposed in this protocol for isolating insect endosymbionts involves using specific media and a sandwich method to provide the essential environment required for their growth.