The United States Bill of Rights comprises the first ten amendments to the United States Constitution.

Proposed following the often bitter 1787–88 debate over the ratification of the Constitution, and written to address the objections raised by Anti-Federalists, the Bill of Rights amendments add to the Constitution specific guarantees of personal freedoms and rights, clear limitations on the government's power in judicial and other proceedings, and explicit declarations that all powers not specifically granted to the U.S. Congress by the Constitution are reserved for the states or the people.

The concepts codified in these amendments are built upon those found in earlier documents, especially the Virginia Declaration of Rights (1776), as well as the English Bill of Rights (1689) and the Magna Carta (1215).