 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 Fungshu, Hannah Milford A. and Sunruin Song.