Presidential elections were held in Ukraine on 31 October, 21 November, 26 December 2004 and 1 January 2005. This was the fourth presidential election in Ukraine following independence from the Soviet Union. The last stages of the election were contested between the opposition leader Viktor Yushchenko and incumbent Prime Minister Viktor Yanukovych from the Party of Regions. It was later determined by the Ukrainian Supreme Court that the election was plagued by widespread falsification of the results in favour of Yanukovych.
According to Ukraine's electoral law, a two-round system is used to elect the president in which a candidate must win a majority (50% or more) of all ballots cast. The first round of voting was held on 31 October. As no candidate received over 50% of all votes cast, a run-off between the two highest-polling candidates, Yushchenko and Yanukovych, was held on 21 November. According to official Central Election Commission results announced on 23 November, the run-off election was won by Yanukovych. However, the results were challenged by Yushchenko and his supporters, with many western observers claiming that the election was rigged.