<p>The world today is experiencing an energy crisis everywhere, and scientists all over the world are currently working on the design and synthesis of new nanomaterials in order to combat the crisis. Samarium-based nanomaterials have become promising electrode materials for supercapacitor fabrication due to their structural, magnetic, and electrochemical properties. Various synthesis methods can be used to control particle size, morphology, and composition, which are key determinants in supercapacitor performance. Sm-incorporated nanostructures exhibit high structural characteristics and electrochemical characteristics, which largely lead to their possible applications in different areas, including catalysis, energy storage, biomedical applications, sensors, and CO conversion. The samarium-doped and composite nanomaterials exhibit a high specific capacitance, high cycling stability and enhanced energy / power density as a result of synergistic effect. Further modification of the samarium nanoparticles with carbon-based materials and transition metal oxides improves the charge storing abilities and the lifespan of these devices and thus present viable options to the next generation of energy-storage devices. This review highlights various strategies in synthesis, characterization, and applications, of Sm based materials especially focusing on supercapacitor behavior.</p> Graphical Abstract <p></p>