List of amendments to the Constitution of the United States

This article is about the ratified and unratified amendments to the United States Constitution which have received the approval of the U.S. Congress. For proposals to amend the U.S. Constitution introduced in but not approved by Congress, see List of proposed amendments to the United States Constitution.

Thirty-three amendments to the Constitution of the United States (also referred to formally as articles of amendment) have been proposed by the United States Congress and sent to the states for ratification since the Constitution was put into operation on March 4, 1789. Twenty-seven of those, having been ratified by the requisite number of states, are now part of the Constitution.

The first ten amendments were adopted and sent to the states by Congress as a group, and later were also ratified together (and thus simultaneously); these are collectively known as the Bill of Rights. The 13th, 14th, and 15th amendments deal with slavery, equal protection and certain constitutional rights; collectively, these are known as the Reconstruction Amendments.

Six or Seven proposed amendments have been adopted by Congress and sent to the states, but have not been ratified by the required number of states (50) and so do not (yet) form part of the Constitution. Four of these unratified amendments are still pending; one is closed having failed by its own terms; and one is closed and has failed by the terms of the resolution proposing it.

All 33 (27 ratified plus 6 unratified) amendments are listed and detailed in the tables below.

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