c. 57), often cited as the Supreme Court of Judicature (Ireland) Act 1877, was an act of the Parliament of the United Kingdom that brought about a major reorganisation of the superior courts in Ireland.

The Act marked the fusion of the administration of common law and equity in Ireland, although not a merger of the jurisdictions themselves.

The Irish Free State was established on 6 December 1922, comprising the territory which had been designated as Southern Ireland.

Article 75 of the Constitution of the Irish Free State carried over the existing court structure for Southern Ireland; this included the courts established under the 1920 Act, with the exception of the High Court of Appeal for Ireland, which was abolished by the Irish Free State (Consequential Provisions) Act 1922, an act of the United Kingdom Parliament.

[8] However, that Act established a new Supreme Court of Judicature that is of largely the same shape as that established under the 1920 Act, although it also includes a Crown Court in Northern Ireland (which tries indictable offences).