European Society for Therapeutic Radiology and Oncology (ESTRO) was founded in Milano in September 1980. as a society of individual members working in the field of radiotherapy and oncology.

Its principal objectives are to foster radiation oncology in all its aspects and to develop standards for the Q.A. of radiation oncology, radiophysics, radiation technology and radiobiology in Europe and stimulate their implementation.

ESTRO also wishes to improve the standards of cancer treatment by establishing radiation oncology as a clinical specialty integrated with other cancer treatment modalities.

They set education standards and practice in radiation oncology and associated professions while establishing relationships and cooperation with international, regional and national societies and bodies in the field of radiation oncology.

ESTRO was accepted as UICC Associate member in 2005.