Northern Ireland (Emergency Provisions) Act 1973

The Northern Ireland (Emergency Provisions) Act 1973 (c. 53) is an act of the Parliament of the United Kingdom which abolished the death penalty for murder in Northern Ireland, and established the Diplock courts in which terrorist offences were tried by a judge without a jury. It has mostly been repealed, the anti-terrorism provisions having been superseded by subsequent legislation. The death penalty had not been used in Northern Ireland since 1961, when Robert McGladdery was hanged.

The act banned membership under penalty of law in the following organisations:
 * Irish Republican Army
 * Cumann na mBan
 * Fianna Éireann
 * Saor Éire
 * Sinn Féin
 * Ulster Volunteer Force

The subsequent Elected Authorities (Northern Ireland) Act 1989 would require oaths renouncing these organisations (except Sinn Féin).