The 15th International Conference on Accelerator Mass Spectrometry (AMS-15) takes place in the harbour city of Sydney, Australia, in September, 2021. The conference will take place at John Niland Scientia, located on the Kensington campus of the University of New South Wales (UNSW). We look forward to bringing the AMS global community together for a stimulating and exciting scientific program with an Australian flavour. We hope you will also get to see some of the world famous tourist sites across Australia and enjoy the world-class hospitality offered by Sydney.