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The Nineteenth Amendment (Amendment XIX) to the United States Constitution prohibits any United States citizen to be denied the right to vote based on sex. It was ratified on August 18, 1920. The Constitution allows the states to determine the qualifications for voting, and until the 1910s most states disenfranchised women. The amendment was the culmination of the women's suffrage movement in the United States, which fought at both state and national levels to achieve the vote. It effectively overruled Minor v. Happersett, in which a unanimous Supreme Court ruled that the Fourteenth Amendment did not apply to women or give them a right to vote.

Susan B. Anthony and Elizabeth Cady Stanton drafted the amendment and first introduced it in 1878; it was forty-one years later, in 1919, when the Congress submitted the amendment to the states for ratification. A year later, it was ratified by the requisite number of states, with Tennessee's ratification being the final vote needed to add the amendment to the Constitution. In Leser v. Garnett (1922), the Supreme Court rejected claims that the amendment was unconstitutionally adopted.

The Nineteenth Amendment's text was drafted by Susan B. Anthony with the assistance of Elizabeth Cady Stanton. The proposed amendment was first introduced in the Senate, colloquially as the "Anthony Amendment", by Republican Senator Aaron A. Sargent of California. Sargent, who had met and befriended Anthony on a train ride in 1872, was a dedicated women's suffrage advocate. He had frequently attempted to insert women's suffrage provisions into unrelated bills, but did not formally introduce a constitutional amendment until January 1878. Stanton and other women testified before the Senate in support of the amendment. The proposal sat in a committee until it was considered by the full Senate and rejected in a 16 to 34 vote in 1887.

A three-decade period known as "the doldrums" followed, during which the amendment was not considered by Congress and the women's suffrage movement achieved few victories. During this period, the suffragists pressed for the right to vote in the laws of individual states and territories while retaining the goal of federal recognition. A flurry of activity began in 1910 and 1911 with surprise successes in Washington and California. Over the next few years, most western states passed legislation or voter referenda enacting full or partial suffrage for women. These successes were linked to the 1912 election, which saw the rise of the Progressive and Socialist parties, as well as the election of Democratic President Woodrow Wilson. Not until 1914 was the constitutional amendment again considered by the Senate, where it was again rejected.

On January 12, 1915, a proposal to amend the Constitution to provide for women's suffrage was brought before the House of Representatives, but was defeated by a vote of 204 to 174. Another proposal was brought before the House on January 10, 1918. During the previous evening, President Wilson made a strong and widely published appeal to the House to pass the amendment. It was passed by the required two-thirds of the House, with only one vote to spare. The vote was then carried into the Senate. Wilson again made an appeal, but on September 30, 1918, the proposal fell two votes short of passage. On February 10, 1919, it was again voted upon and failed by only one vote.

There was considerable desire among politicians of both parties to have the proposal made part of the Constitution before the 1920 general elections, so the President called a special session of the Congress so the proposal would be brought before the House again. On May 21, 1919, it passed the House, 42 votes more than necessary being obtained. On June 4, 1919, it was brought before the Senate and, after a long discussion, it was passed with 56 ayes and 25 nays. Within a few days, Illinois, Wisconsin, and Michigan ratified the amendment, their legislatures being in session. Other states followed suit at a regular pace, until the amendment had been ratified by 35 of the necessary 36 state legislatures. On August 18, 1920, Tennessee narrowly approved the Nineteenth Amendment, with 50 of 99 members of the Tennessee House of Representatives voting yes. This provided the final ratification necessary to enact the amendment.