Organ sale – for example, allowing or encouraging consenting adults to become living kidney donors in return for money – has been proposed as a possible solution to the seemingly chronic shortage of organs for transplantation. Many people however regard this idea as abhorrent and argue both that the practice would be unethical and that it should be banned. This entry outlines some of the different possible kinds of organ sale, briefly states the case in favour, and then examines the main arguments against.