The book "Rheology of Filled Polymer Systems" by A. V. Shenoy provides a comprehensive analysis of the rheological properties of filled polymer materials. In recent years, polymers have increasingly established themselves as substitutes for traditional materials such as metals, glass, and wood. The integration of fillers into polymers is a common practice to reduce costs and enhance specific mechanical, thermal, electrical, and magnetic properties. Given the rising energy prices and the costs of petrochemical products, the demand for filled polymer materials has increased. This book highlights the challenges and complexities associated with the rheology of filled polymer systems, particularly the impacts on processing and the need to strike a balance between improved properties and processability.