Nanofillers have shown significant potential in improving the performance and efficiency of various catalysts. The incorporation of nanofillers into catalysts can enhance their surface area, increase their active sites, and improve their stability and selectivity. This chapter provides an overview of the current state of research on the use of nanofillers, such as graphene, carbon nanotubes, and metal oxides, as well as nanocomposites, in the synthesis of catalysts for various applications, including environmental remediation, energy conversion, and chemical synthesis. The chapter also discusses the challenges and opportunities associated with the incorporation of nanofillers in catalysts, including the need for careful consideration of various factors, such as the type and size of the nanofillers, the catalyst support material, and the reaction conditions. Overall, this chapter highlights the potential of using nanofillers in catalysts to improve the performance and efficiency of various catalytic processes and provides insights into the future directions of this exciting field.