Preface to Special Issue on Green Conversion of HMF.

In this Editorial, Guest Editors Stefania Albonetti, Changwei Hu, and Shunmugavel Saravanamurugan introduce the Special Issue of ChemSusChem on Green Conversion of HMF. The significance of and enormous challenges for the sustainable transformation of 5-hydroxymethylfurfural are reviewed, and the contents of the Special Issue with highly interesting contributions from scientists around the world are outlined.