July 11-15, 2021 – Graz, Austria. The 20th International Symposium on Flavins and Flavoproteins will take place July 12-16, at Technische Universtät Graz in Graz, Austria. From spectroscopy, synthesis and catalytic mechanisms, through enzyme engineering, evolution and signalling, to human medicine. Flavins feature in essentially all aspects of biological chemistry, making this a broad meeting despite its flavin-focus. This meeting occurs only once every three years.