The Judicial Committee of the Privy Council is one of the highest courts in the United Kingdom. It is also the highest court of appeal (or court of last resort) for several independent British Commonwealth countries, the UK overseas territories and the British crown dependencies. It is simply referred to simply to the Privy Council, as appeals are in fact made to Her Majesty in Council who then refers the case to the Judicial Committee for "advice". In Commonwealth republics, appeals are made directly to the Judicial Committee instead. Formerly the Judicial Committee gave a single piece of advice, but since the 1960s dissenting opinions have been allowed.

The judicial system of the United Kingdom is unusual in having no single highest national court; the Judicial Committee is the highest court of appeal in some cases, while in most others the highest court of appeal is the House of Lords. In Scottish criminal cases the highest court is the High Court of Justiciary.

The Judicial Committee:

• Acts as highest court of appeal for certain Commonwealth countries, namely New Zealand, several Caribbean countries (Antigua and Barbuda, Bahamas, Barbados, Belize, Dominica, Grenada, Jamaica, St. Christopher and Nevis, Saint Lucia, Saint Vincent and the Grenadines and Trinidad and Tobago), Kiribati and Tuvalu in the Pacific Ocean and Mauritius in the Indian Ocean. The Court will soon only hear cases from the final three nations, as most of the other nations have abolished their countries' right of appeal (see below).
• Acts as highest court of appeal for UK Overseas Territories, namely Anguilla, Bermuda, British Antarctic Territory, British Indian Ocean Territory, British Virgin Islands, Cayman Islands, Falkland Islands, Gibraltar, Montserrat, St. Helena, Turks and Caicos Islands and the British sovereign bases in Cyprus.
• Acts as highest court of appeal for the British crown dependencies, namely the Isle of Man and the Channel Islands.
• Devolution issues arising under the Scotland Act 1998, the Government of Wales Act 1998, or the Northern Ireland Act 1998, i.e. disputes regarding the validity of acts of the Scottish Parliament, Welsh Assembly or Northern Ireland Assembly.
• Appeals from disciplinary committees of various professional regulatory bodies in the UK.
• Certain cases involving the Church of England on appeal from the Ecclesiastical courts.
• Disputes concerning whether someone is eligible to be elected to the British House of Commons
• Appeals from Prize Courts
• Appeals in certain admiralty cases.

The Law Lords serve as members of the Judicial Committee, which also includes Privy Counsellors who are members of superior courts in other Commonwealth countries. There are presently 15 such overseas members. The bulk of the work is done by the Lords of Appeal in Ordinary, who are paid to work full time on the judicial functions of the House of Lords and the Privy Council.

The end of Commonwealth Appeals

Initally, all members of the Commonwealth had the right to appeal cases to the privy council. However, over time many countries began to see the Council as being out of tune with local values, and an obstacle to full judicial soverignity.

In Australia the right of appeal was effectively abolished from the Commonwealth Courts by the Privy Council (Limitation of Appeals) Act 1968 and the Privy Council (Appeals from the High Court) Act 1975, and from the State courts by the Australia Act 1986. The Australian constitution still has a provision restricting appeal to the Privy Council on certain matters without the leave of the High Court of Australia (the Privy Council could hear appeals on other subjects without the High Court's permission), so theoretically appeal is still possible on those subjects. However, the High Court has stated that it will not give such permission, so the possibility is purely theoretical.

Appeals could also be made from Canada until 1949, and even after the Supreme Court of Canada was founded in 1875. During that time appeals to the Privy Council could bypass the Supreme Court.

In 2003 the Parliament of New Zealand enacted legislation to abandon appeals to the Privy Council in favour of establishing the new Supreme Court of New Zealand. This court is expected to be operational by mid-2004.

The nations of the Carribbean Community similarly voted in 2001 to abolish the right of appeal to the privy council in favor of the Caribbean Court of Justice. Debate between member countries have repeatedly delayed the court's date of operation, however.