Rice husk, a renewable and abundant agricultural waste, presents a valuable precursor for the development of diverse carbon, silicon, and silica-based nanomaterials. Some of these rice husk-derived materials, characterized by distinct physical structures, surface chemistries, and textural properties, exhibit significant potential in various energy applications, including supercapacitors, batteries, energy-related redox reactions, solar photovoltaics, thermal energy storage and triboelectric devices. The co-existence of inorganic and organic components within these nanomaterials can offer unique advantages in some applications. This book chapter discusses the recent developments in using various rice husk-derived materials in various energy applications, as well as the relevant structure-property relationships.