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The international society for professionals who care for the emotional and social side of cancer; it sets the standard that every person with cancer should have psychological care, and its federation links national societies in 28 countries.
The International Psycho-Oncology Society states on its About page that it was founded in 1984 to foster international multidisciplinary communication on two dimensions of cancer: how patients, families and staff respond to cancer and its treatment at every stage, and the psychological, social and behavioural factors that influence tumour progression and survival. Its members include psychologists, nurses, social workers, psychiatrists, dieticians, spiritual care specialists, physicians, patient advocates and others. It publishes the IPOS Standard of Quality Cancer Care, runs a multilingual core curriculum in psycho-oncology, a World Congress and World Psycho-Oncology Day, and with ESMO and the European Cancer Patient Coalition produced a patient guide on survivorship. The IPOS Federation of national psycho-oncology societies has its stated objective as speaking in a unified voice for optimal psychosocial care for all cancer patients and their families at all stages of disease and survivorship; on 4 November 2026 its Federation page listed 36 countries, 28 of them with a country page naming the national society. The postal address on its site is in Toronto, with a second address in New York.
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