The book focuses on developments in the microwave-assisted preparation of organic and inorganic compounds, advanced composite materials, polymers, and nanostructures. Keywords: Microwave-Assisted Synthesis, Bioactive Heterocycles, Medicinal Chemistry, Synthesis of Polypyrrole, Environmental Pollutant Adsorption, Zeolite Synthesis, Synthesis of Ionic Liquids, Radiopharmaceuticals, Targeted Drug Delivery, Pyrolysis of Biomass, Photocatalysts for Hydrogen Production.