 Piezoelectric materials are widely referred to as smart materials because they can transduse mechanical pressure acting on them to electrical signals and vice versa. They are extensively utilized in harvesting mechanical energy from vibrations, human motion, mechanical loads, etc. and converting them into electrical energy for low-power devices. This review aims to give a holistic overview of recent developments in piezoelectric nanostructured materials, polymers, polymer nanocomposites, and piezoelectric films for implementation in energy harvesting. This article was authored by Susmairi Das Mahapatra, Pritam Chandan Mohapatra, Adryanis Indred Arya, and others.