Euthanasia describes an intentional
act to end a person’s life to relieve pain or suffering, typically by a clinician administering a life‑ending intervention.
The term is not defined in UK or Irish statute and is generally used descriptively in legal practice and case law to distinguish active life‑ending from: (i) assisted suicide; and (ii) lawful end‑of‑life care such as withholding/withdrawing futile treatment, honouring valid advance decisions/directives to refuse treatment, or giving proportionate analgesia that may foreseeably shorten life (the double effect: see Airedale NHS Trust v Bland; in Ireland, Re a Ward of Court (No 2)).
Across England & Wales, Scotland, Northern Ireland and Ireland, active euthanasia amounts to unlawful killing (murder or manslaughter; culpable homicide in Scotland). Assisting or encouraging suicide is a separate offence: Suicide Act 1961 s 2 (England & Wales), Criminal Justice (Northern Ireland) Act 1966 s 13 (Northern Ireland), and Criminal Law (Suicide) Act 1993 s 2 (Ireland).
In practice, the term arises in end‑of‑life decision‑making, consent and capacity, criminal charging decisions, coroner/procurator fiscal investigations, clinical negligence, and professional regulation, and is often contrasted with “assisted dying” in legislative and ethics debates. Usage is broadly consistent across the four jurisdictions.