Suicide prevention initiatives are part of much broader systems connected to activities such as the diagnosis of mental illness, the recognition of clinical risk, improving access to care, and coordinating with a broad range of outside agencies and entities around both prevention and public health efforts. Yet suicide is also an intensely personal issue that continues to be surrounded by stigma. On September 11-12, 2018, the National Academies of Sciences, Engineering, and Medicine held a workshop in Washington, DC, to discuss preventing suicide among people with serious mental illness. The workshop was designed to illustrate and discuss what is known, what is currently being done, and what needs to be done to identify and reduce suicide risk. Improving Care to Prevent Suicide Among People with Serious Mental Illness summarizes presentations and discussions of the workshop.