“Medical Tourism” is the travel of residents of one country to another country for treatment. In this article I focus on travel abroad to purchase organs for transplant, what I will call “Transplant Tourism.” With the exception of Iran, organ sale is illegal across the globe, but many destination countries have thriving black markets, either due to their willful failure to police the practice or more good faith lack of resources to detect it. I focus on the sale of kidneys, (...) the most common subject of transplant tourism, though much of what I say could be applied to other organs as well. Part I briefly reviews some data on sellers, recipients, and brokers. Part II discusses the bioethical issues posed by the trade, and Part III focuses on potential regulation to deal with these issues. (shrink)