《美利坚合众国宪法》第二十一修正案（英語：Twenty-first Amendment to the United States Constitution）簡稱「第二十一修正案」（Amendment XXI）于1933年2月20日提出，同年12月5日获得法定3/4的州的批准而生效。这条修正案废除了1917年12月18日提出，1919年1月16日批准生效的《美国宪法》第十八修正案，该修正案授权从1920年1月17日开始在全国范围内禁酒。第二十一修正案是美利坚合众国宪法的全部27条修正案中唯一用于废除之前通过修正案的，并且也是其中唯一一条由州制宪会议批准的修正案[註 1]。
内容文本
Section 1. The eighteenth article of amendment to the Constitution of the United States is hereby repealed.
Section 2. The transportation or importation into any State, Territory, or possession of the United States for delivery or use therein of intoxicating liquors, in violation of the laws thereof, is hereby prohibited.
Section 3. This article shall be inoperative unless it shall have been ratified as an amendment to the Constitution by conventions in the several States, as provided in the Constitution, within seven years from the date of the submission hereof to the States by the Congress.
When Prohibition was introduced, I hoped that it would be widely supported by public opinion and the day would soon come when the evil effects of alcohol would be recognized. I have slowly and reluctantly come to believe that this has not been the result. Instead, drinking has generally increased; the speakeasy has replaced the saloon; a vast army of lawbreakers has appeared; many of our best citizens have openly ignored Prohibition; respect for the law has been greatly lessened; and crime has increased to a level never seen before.[4]
^Citizen or Subject?. [2013-04-09]. （原始内容存档于2010-10-13）. "An Overlooked Reconsideration of a Fundamental Question in U.S. Constitutional Law." Gilder, Eric and Hagger, Mervyn. British and American Studies (University of the West, Timisoara) 13 (2007): 163-74.
