This review discusses recent advancements in magnetic nanocomposites for electromagnetic interference (EMI) shielding. The article explores the synthesis, properties, and mechanisms of these materials, emphasizing their multifunctional nature that combines magnetic and conductive components to enhance microwave absorption and reflection. It begins by explaining the physics of EMI shielding mechanisms, including reflection, absorption, and multiple internal reflections. The magnetic properties of nanocomposite constituents are discussed, highlighting their role in enabling magnetic loss, dielectric loss, and eddy current induction. Common synthesis techniques such as co-precipitation, sol-gel, and hydrothermal methods are examined, along with the resulting nanocomposite characteristics and EMI shielding performance. Innovative fabrication strategies based on physical vapor deposition are highlighted for their precision in controlling nanostructure morphology. The review also explores the interplay between dielectric, conductive, and magnetic nanocomposite components and their synergistic influence on EMI shielding. Current challenges, such as nanoparticle agglomeration and environmental durability, are discussed, as well as scalable production methods for real-world applications. The review synthesizes the frontiers of magnetic nanocomposite engineering, design, and fabrication for next-generation EMI shielding materials with tailored, application-specific shielding capabilities. EMI is a significant issue in the modern era, affecting various industries and systems. It is caused by unexpected electromagnetic emissions overlapping, leading to disruptions in electronic devices or systems. EMI spans a wide range of frequencies, from low-frequency power line outputs to high-frequency radio waves. The review also analyzes global research contributions and emerging patterns in nanocomposite studies, showing a peak in research activity in 2021 followed by a significant decline in 2022 and 2023. The analysis is based on data from the Scopus database, providing insights into global research trends until 2023.This review discusses recent advancements in magnetic nanocomposites for electromagnetic interference (EMI) shielding. The article explores the synthesis, properties, and mechanisms of these materials, emphasizing their multifunctional nature that combines magnetic and conductive components to enhance microwave absorption and reflection. It begins by explaining the physics of EMI shielding mechanisms, including reflection, absorption, and multiple internal reflections. The magnetic properties of nanocomposite constituents are discussed, highlighting their role in enabling magnetic loss, dielectric loss, and eddy current induction. Common synthesis techniques such as co-precipitation, sol-gel, and hydrothermal methods are examined, along with the resulting nanocomposite characteristics and EMI shielding performance. Innovative fabrication strategies based on physical vapor deposition are highlighted for their precision in controlling nanostructure morphology. The review also explores the interplay between dielectric, conductive, and magnetic nanocomposite components and their synergistic influence on EMI shielding. Current challenges, such as nanoparticle agglomeration and environmental durability, are discussed, as well as scalable production methods for real-world applications. The review synthesizes the frontiers of magnetic nanocomposite engineering, design, and fabrication for next-generation EMI shielding materials with tailored, application-specific shielding capabilities. EMI is a significant issue in the modern era, affecting various industries and systems. It is caused by unexpected electromagnetic emissions overlapping, leading to disruptions in electronic devices or systems. EMI spans a wide range of frequencies, from low-frequency power line outputs to high-frequency radio waves. The review also analyzes global research contributions and emerging patterns in nanocomposite studies, showing a peak in research activity in 2021 followed by a significant decline in 2022 and 2023. The analysis is based on data from the Scopus database, providing insights into global research trends until 2023.