The Chief Justice is the presiding member of a supreme court in any of many countries with a justice system based on English common law, such as the Supreme Court of Canada, the Supreme Court of Singapore, the Court of Final Appeal of Hong Kong, the Supreme Court of Japan, the Supreme Court of India, the Supreme Court of Pakistan, the Supreme Court of Nepal, the Constitutional Court of South Africa, the Supreme Court of Ireland, the Supreme Court of New Zealand, the High Court of Australia, the Supreme Court of the United States, and provincial or state supreme courts.
The situation is slightly different in the three legal jurisdictions within the United Kingdom. The courts of England and Wales are headed by the Lord Chief Justice of England and Wales; in Northern Ireland's courts, the equivalent position is the Lord Chief Justice of Northern Ireland and in Scottish courts, the equivalent is the Lord President of the Court of Session. These three judges are not, though, part of the Supreme Court of the United Kingdom, which operates across all three jurisdictions and is headed by the President of the Supreme Court of the United Kingdom.