The European Society for Radiotherapy and Oncology (ESTRO) is a non-profit and scientific organisation that advances all aspects of radiation oncology in order to improve patients’ care in the multimodality treatment of cancer. ESTRO’s mission is to promote best practice, research and dissemination of science through its special meetings, educational courses and publications. With over 6,500 members in and outside Europe, ESTRO supports all the radiation oncology professionals in their daily practice: radiation oncologists, medical physicists, radiobiologists and radiation therapists (RTTs) and the wider oncology community.