This book covered the general information comprises of work-done in castor oil extraction using soxhlet extraction method, refining of the oil (degumming and neutralization), biodiesel production using transesterification method, optimization of the production process using Taguchi orthogonal array design, kinetics of the production process, biodiesel blend with conventional diesel and physicochemical properties of the oils (raw castor oil, refined castor oil, biodiesel produced and diesel blends).