The increasing demand for energy worldwide, together with the depletion of crude oil reserves, environmental threats due to greenhouse gas emissions and new national and international legislation, is resulting in the imperative for petroleum-derived fuels to be complemented or substituted by biofuels. Such an alternative, renewable, biodegradable and nontoxic biofuel is biodiesel. The book “Biodiesel: Feedstocks and Processing Technologies” is intended to provide a professional look on the recent achievements and emerging trends in biodiesel production. It includes 21 chapters, organized in two sections