The Supreme Court of Ireland is the highest judicial authority in Ireland. It is a court of final appeal and exercises, in conjunction with the Court of Appeal and the High Court, judicial review over Acts of the Oireachtas. The Supreme Court also has appellate jurisdiction to ensure compliance with the Constitution of Ireland by governmental bodies and private citizens. It sits in the Four Courts in Dublin.

The law of the Republic of Ireland consists of constitutional, statutory, and common law. The highest law in the State is the Constitution of Ireland, from which all other law derives its authority. The Republic has a common-law legal system with a written constitution that provides for a parliamentary democracy based on the British parliamentary system, albeit with a popularly elected president, a separation of powers, a developed system of constitutional rights and judicial review of primary legislation.