 The green synthesis of nanoparticles has become increasingly popular due to its environmental friendliness, cost-effectiveness, simplicity, and wide range of applications. Agro-waste, enzymes, and pigments derived from microorganisms and plants are being used to produce metallic nanoparticles with promising results. This review paper provides a comprehensive summary of the current research on the use of these resources for the production of metallic nanoparticles. This article was authored by Adelaer Iziaka A. and Lateefig Bage.