The International Roundtable on Nucleosides, Nucleotides and Nucleic Acids will be held in Stockholm, August 22-25th, 2021, rescheduled from August 2020 due to COVID-19. The meeting has a tremendous line-up of invited speakers and gathers researchers from around the world in topics related to the chemistry, biology and medicine of oligonucleotides/nucleic acids and their components.