Greenhouse gas emissions reduction and climate change mitigation are among the biggest challenges facing societies right now and in the future. The increasing population has caused agriculture and food waste to become major issues affecting the environment and climate. Therefore, a renewable energy source, such as biogas, is a good alternative to replace fossil fuels. It is possible to produce biogas from a wide range of organic waste streams and by-products of industrial processes.  Anaerobic digestion (AD) of organic waste is an efficient means of producing fossil free energy with synergistic sustainable waste management. Nevertheless, it requires a circular economy and an integrated waste-management system. The integration of AD and pyrolysis is not only for treating agricultural and food wastes and prospects for biogas production but also could be a sustainable approach towards providing nutrients and resources. Moreover, addition of the by-product of the pyrolysis viz. biochar in AD processes could stabilize and increasing the quality and quantity of biogas production, improving soil fertility and promote the circular bioeconomy. This study aims to critically assesses the available strategies for enhancing biogas production and to explore the synergistic effects of integrated AD and pyrolysis of agro-food waste that will promote the concept of a circular bioeconomy to reduce the negative impact on the environment including carbon footprints, which encourage the scientists, industrialists, and policy makers to explore integrated concepts for using organic waste in biofuel production.