The book covers such diverse topics as cellulose fibers in cement paste and concrete, biodegradable materials for dental applications, coconut and pineapple fiber composites, biodegradable plastic composites, durability against fatigue and moisture, physical and mechanical characterization of fiber composites, improving the hydrophobic nature of fiber composites, and hybrid natural fiber composites. Keywords: Fiber Reinforced Composites, Biodegradable Composites, Polymethyl Methacrylate, Cellulose Fibers, Coconut Fibers, Biocomposites, Resol-Vegetable Fibers, Pineapple Natural Fiber Composite, Dental Applications, Cement Paste, Concrete, Thermoplasticity, Fatigue, Moisture, Thermal Conductivity.