Considering numerous applications in biomedical, electronic devices, wastewater treatment, industries etc. spinel ferrite nanoparticles have becomematerials great interest. Because of its many advantages over conventional synthesis techniques, the green or bio production of ferrite nanoparticles has attracted enough attention recently. The green production of spinel ferrite nanoparticles, their characterisation, and their utilisation in many fields are the main topics of this review article. The use of plant extracts or plant-based synthesis techniques of spinel ferrites is discussed.