English: Fossil fuels resources are continually running out due to the rapid rise in industrialization and outgrowth. Moreover, the excessive utilization of fossil fuel has resulted in release of various toxic gases and global warming. Hence, it necessitates the demand to explore for an inexhaustible, renewable and eco-friendly energy sources. In this review, various waste biomasses which are abundantly available throughout the world have been reviewed as a feedstock for obtaining various value added products i.e. bio-oil, gases and biochar etc., using various pyrolysis techniques. The pyrolysis is considered to be the most effective conversion technique in which three stage degradation mechanism is observed leading to the production of valuable hydrocarbons from decomposition of hemicelluloses, cellulose and lignin. The bio-oil obtained if upgraded properly, is served as fuel for commercial use.