This book provides an overview on the latest advances in the synthesis, properties and applications of polymeric eco-composites and eco-nanocomposites reinforced natural fibers (e.g. pulp-fiber, flax, etc.) and nanofillers (e.g. organoclay, nano-SiC, etc.). Potential challenges and future directions of these composites are highlighted and addressed. This book offers numerous graphs and electron micrographs for easy understanding by students, researchers and practicing engineers.