 Abstract biodiesel is a promising alternative and renewable fuel. As its production increases, so does production of the principal co-product, crude glycerol. The effective utilization of crude glycerol will contribute to the viability of biodiesel. In this review, composition and quality factors of crude glycerol are discussed. The value added utilization opportunities of crude glycerol are reviewed. The majority of crude glycerol is used as feedstock for production of other value added chemicals, followed by animal feeds. This article was authored by Yang Fengxia, Hannah Milford A. and Sun Ruan Tsang.