Rice husk a major byproduct of rice milling has increased with global rice production, presenting both opportunities and challenges. Traditionally seen as agricultural waste, it’s disposal is a major environmental concern. However, owing to its distinct composition such as substantial amounts of cellulose, hemicellulose, lignin and high content of silica, it can be processed to produce valuable products. However, to fully utilize its potential, specific processing techniques are needed because of its unique physical and chemical properties, which include a high ash content and low bulk density. Recent progress in thermal processing methods like pyrolysis, gasification, have enabled the transformation of rice husk into useful materials such as rice husk ash and biochar, as well as energy products like heat, electricity, and biofuels. In addition to offering a solution for the disposal issue, each of these processes supports environmental preservation and sustainable energy use. Additionally, the densification of rice husk into briquettes and pellets improves its use in industrial settings, while the carbonized rice husk process yields activated carbon and biochar, which have further environmental benefits such as improving soil and sequestering carbon. Leveraging rice husk processing's benefits in energy production and industrial uses requires an understanding of its full potential. To promote sustainable practices and lessen the environmental impact of rice production, this chapter will present a thorough review of the numerous applications of rice husk.