2004 United States election voting controversies

During the 2004 United States elections, concerns were raised about various aspects of the voting process, including whether voting had been made accessible to all those entitled to vote, whether ineligible voters were registered, whether voters were registered multiple times, and whether the votes cast had been correctly counted. More controversial was the charge that these issues might have affected the reported outcome of the presidential election, in which the incumbent, Republican President George W. Bush, defeated the Democratic challenger, Senator John Kerry. Despite the existing controversies, Kerry conceded the election the following day on November 3.

There was generally less attention paid to the Senate and House elections and to various state races, but some of them were also questioned, especially the gubernatorial election in Washington, which was decided by less than 0.01% and involved several recounts and lawsuits. The final recount also reversed the outcome of this election.