Cancer treatment can lead to an array of significant short- and long-term physical, psychosocial, and socioeconomic consequences for patients and their families. To examine the opportunities to prevent and mitigate the adverse effects of cancer treatment, the National Academies of Sciences, Engineering, and Medicine hosted a virtual workshop, Addressing the Adverse Consequences of Cancer Treatment, in November 2020. This workshop was convened by the Academies' National Cancer Policy Forum in collaboration with the Forum on Aging, Disability, and Independence. Workshop presentations and discussions described the range of adverse effects that patients with cancer may experience across the life course, and highlighted potential strategies to improve quality of life for cancer survivors and their families.