This completely revised and updated third edition to the Young Oxford Companion to the Supreme Court of the United States (1994) and The Supreme Court of the United States, second edition (2001) contains a complete, A-to-Z encyclopedia of the Supreme Court, its history, and current operations.

This third edition includes new articles on six cases: American Library Association v. United States (2003), Bush v. Gore (2000), Grutter v. Bollinger (2003), Lawrence v. Texasr (2003), Pierce v. Society of Sisters (1925), and Zelman v. Simmons-Harris (2002). Other new articles cover Fundamental rights doctrine, Intermediate scrutiny, Preferred freedoms doctrine, Strict scrutiny, and National security issues. There are updates to articles on all sitting justices, and new articles on the two newly appointed justices, Chief Justice John Roberts and Samuel Alito.

The following 17 articles are updated with new examples and cases: Abortion, Affirmative action, Appointment of justices, Capital punishment, Due process of law, Equality under the Constitution, Federalism, Freedom of speech and press, Impeachment, Jurisdiction, Lemon test, Privacy, right to, Property rights, Religious issues under the Constitution, Rights of the accused, Searches and seizures, Separation of powers. All of the back matter is thoroughly updated.