We are excited to support the second edition of the Medical Augmented Reality Summer School and International Challenges co-organised by members of the FAROS consortium on August 30-September 10 2021. This edition of MAR 2021 will be a special online format, again bringing together the world’s experts in Medical AR, clinicians, companies and talented academic researchers from all around the world, foster cooperation, and hopefully push the boundaries of Medical Augmented Reality.