This review article explores the recent advancements and understanding of hybrid fillers in composite and nanocomposite materials. The authors highlight the synergistic interactions between hybrid fillers and polymers, which enhance the macro and micro properties of these materials. The review covers various types of hybrid fillers, including organic-inorganic, nano-micro, and bio-based fillers, and examines their impact on mechanical, thermal, and electrical properties. The article also discusses the challenges and opportunities associated with hybrid fillers, emphasizing their potential applications in various industries such as energy storage, electromagnetic interference (EMI) shielding, and flexible electronics. The review concludes by providing a comprehensive overview of the current state of research and future prospects in the field of hybrid fillers for composite and nanocomposite materials.This review article explores the recent advancements and understanding of hybrid fillers in composite and nanocomposite materials. The authors highlight the synergistic interactions between hybrid fillers and polymers, which enhance the macro and micro properties of these materials. The review covers various types of hybrid fillers, including organic-inorganic, nano-micro, and bio-based fillers, and examines their impact on mechanical, thermal, and electrical properties. The article also discusses the challenges and opportunities associated with hybrid fillers, emphasizing their potential applications in various industries such as energy storage, electromagnetic interference (EMI) shielding, and flexible electronics. The review concludes by providing a comprehensive overview of the current state of research and future prospects in the field of hybrid fillers for composite and nanocomposite materials.