Oncology social work is a specialization of social work in health care. Its practitioners provide supportive services and programs, patient navigation, education, research, administration, policy development, and advocacy to address the social, psychological, practical, and spiritual concerns of cancer patients, their families, and caregivers from pre-diagnosis through treatment, survivorship, and end of life care or bereavement. The coming decades will present many challenges and opportunities for oncology social workers in helping patients, families, and caregivers overcome barriers to quality of life and care.