Documentation of future wishes for life-supporting therapy includes living wills, do not resuscitate orders, and designations of a durable power of attorney for health care. All are legally binding mechanisms. Because surgeons may need to refer to these documents, this chapter discusses the use of advance directives and living wills in surgical patients, the use of do not resuscitate orders in the operating room, and the activation and use of power of attorney and subsequent surrogate decision-making. A figure shows a living will designating conditions for resuscitation. This review contains 42 references.