The International Atomic Energy Agency (IAEA) in cooperation with the American Association of Physicists in Medicine (AAPM), the Asia-Oceania Federation of Organization for Medical Physics (AFOMP), the Latin American Association of Medical Physics (ALFIM), the International Bureau of Weights and Measures (BIPM), the European Commission (EC), the European Federation of Organizations for Medical Physics (EFOMP), the European Society for Therapeutic Radiology and Oncology (ESTRO), the International Commission on Radiological Protection (ICRP), the International Commission on Radiation Units and Measurements, Inc (ICRU), the International Organization for Medical Physics (IOMP), the Institute of Physics and Engineering in Medicine (IPEM), the Society of Nuclear Medicine (SNM), the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) and the World Federation of Nuclear Medicine and Biology (WFNMB) is organizing an International Symposium on Standards, Applications and Quality Assurance in Medical Radiation Dosimetry to be held in Vienna, Austria on 9 – 12 November 2010. The major goal of the symposium is to provide a forum where advances in radiation dosimetry during the last decade, in radiation medicine and radiation protection can be disseminated and scientific knowledge exchanged. It will include all specialties in radiation medicine and radiation protection dosimetry with a specific focus on those areas where the standardization of dosimetry has improved in the recent years (brachytherapy, diagnostic radiology and nuclear medicine). It will also summarize the present status and outline future trends in medical radiation dosimetry and identify possible areas for improvement. Its conclusions and summaries should lead to the formulation of recommendations for the scientific community. This symposium will be of interest to a broad spectrum of medical physicists and other scientists working in radiation dosimetry with responsibilities in the following fields: radiation metrology, external beam radiotherapy with photons, electrons and hadrons, brachytherapy including intravascular techniques, diagnostic radiology including CT, mammography and interventional procedures, nuclear medicine and radiation protection dosimetry. The symposium will give an opportunity for scientists in medical institutions, research centres, universities and standards laboratories to meet for discussions covering the entire dosimetry chain.