In this book, the introductory chapter summarizes the thermal properties of the three main types of bio-based polymers as there is natural polymers directly derived from biomass, bio-engineered polymers and polymers synthesized from monomers. The next two chapters are devoted to quiescent and flow-induced crystallization of poly(L-lactic acid)(PLLA). Crystallization of poly[8R)-3-hydroxybutyrate](PHB) is discussed in the next chapter. The following chapter focuses on thermal properties of polyamide 11, a semi-crystalline high-performance thermoplastic engineering polymer product. Last but not least, bio-sourced polymers based on 2.5-furandicarboxylic acid (FDCA) are discussed. The volume ends with a chapter on crystallization of bio-based polyester blends.