Euthanasia (from ; "good death": εὖ, eu; "well" or "good" – θάνατος, thanatos; "death") is the practice of intentionally ending a life in order to relieve pain and suffering.

Involuntary euthanasia occurs when euthanasia is performed on a person who is able to provide informed consent, but does not, either because they do not choose to die, or because they were not asked.