Nanospinel ferrites have been widely known for their magnetic properties since ages. But apart from it, they have been recently recognized as excellent electrode materials due to multiple oxidation states. These materials have been of great consideration for the development of next-generation energy storage devices. This chapter focuses on the utilization of spinel metal ferrites such as ferric oxide (Fe3O4), manganese ferrite (MnFe2O4), zinc ferrite (ZnFe2O4), cobalt ferrite (CoFe2O4), copper ferrite (CuFe2O4), and nickel ferrite (NiFe2O4) in the field of supercapacitors (SCs). The charge storage mechanism in ferrites stems from rapid and reversible surface redox reactions occurring at the interface between the electrode and electrolyte, specifically pseudo-capacitance. For the fabrication of supercapacitors, it is highly desirable to have electrode materials with high specific capacitance, high charge density, large specific surface area, a broad spectrum of operational possibilities, affordability, and plentiful availability on our planet. Ferrites with mixed valency have demonstrated great potential as electrodes in SCs. This chapter provides a comprehensive overview of various synthesis methods employed for producing ferrite-based nanocomposites, along with an analysis of their electrochemical properties relevant to supercapacitor applications. Furthermore, it discusses about the important characterization techniques vital for supercapacitor applications. It also emphasizes the significance of these materials in advancing energy storage technologies in future.