The conventional energy resources like fossil fuels, coal, petroleum and natural gas are depleting day by day, thereby posing a challenge to science in meeting the ever increasing demand of energy . Non Conventional Energy Resources like BIODIESEL seems to be the solution. It is technically feasible, environmentally acceptable, economically competitive and produced from easily available resources. This book therefore gives the exhaustive information of the possible feedstocks (keeping Indian scenario in mind), methods of preparation varying different parameters, physical and chemical properties and ASTM methods used for their calculation, advantages, disadvantages, impact of emission of Biodiesel on environment. This should help to professionals, researchers and everybody aware of the role of biodiesel as the fuel of the moment and the future and looking forward to work in this field.