Karen Ann Quinlan was an American woman who became an important figure in the history of the right to die controversy in the United States.

The right to die is a concept based on the opinion that human beings are entitled to end their life or undergo voluntary euthanasia. Possession of the right to die is often bestowed with the understanding that a person with a terminal illness, incurable pain, or without the will to continue living should be allowed to end their own life, use assisted suicide, or decline life-prolonging treatment. The question of who, if anyone, may be empowered to make this decision is often the subject of debate.