Viktor Fedorovych Yanukovych (born 9 July 1950) is a former Ukrainian politician who served as the fourth president of Ukraine from 2010 to 2014. He also served as the prime minister of Ukraine several times between 2002 and 2007 and was a member of the Verkhovna Rada (parliament) from 2006 to 2010. Yanukovych was removed from the presidency during the 2014 Revolution of Dignity, which followed months of protests against him. Since then, he has lived in exile in Russia.

Yanukovych was a member of the pro-Russian Party of Regions. Before entering national politics, Yanukovych was the Governor of his native Donetsk Oblast from 1997 to 2002. He was simultaneously the Chairman of the oblast's legislature from 1999 to 2001. He first ran for president in the 2004 election, where he was declared the winner against Viktor Yushchenko. However, allegations of electoral fraud and voter intimidation caused widespread protests, in what became known as the Orange Revolution. The Ukrainian Supreme Court nullified the election and ordered a rerun, which Yanukovych lost to Yushchenko. Yanukovych ran for president again in 2010, this time beating Yulia Tymoshenko in an election deemed free and fair by international observers.

Yanukovych stood for economic modernisation, greater economic ties with the EU, and military non-alignment. However, his years in power saw what analysts described as democratic backsliding, which included the jailing of Tymoshenko, a decline in press freedom and an increase in cronyism and corruption. In November 2013, Yanukovych suddenly withdrew from signing an association agreement with the EU, amidst economic pressure from Russia. Ukraine's parliament had overwhelmingly approved finalizing the agreement. This sparked massive protests against him, known as the Euromaidan. The unrest peaked in February 2014, when almost 100 protesters were killed by government forces. An agreement was signed by Yanukovych and the opposition on 21 February 2014, but he secretly fled the capital that evening. The next day, Ukraine's parliament voted to remove him and schedule early elections on the grounds that he had withdrawn from his constitutional duties. Some of his own party voted for his removal.

Ukraine's new government issued an arrest warrant for Yanukovych, accusing him of responsibility for the killing of protesters. He fled to Russia, claiming to still be the head of state. In 2019, he was sentenced in absentia to a thirteen-year prison term for high treason by a Ukrainian court. In polling conducted since he left office, Yanukovych has ranked as one of the worst presidents in Ukrainian history. Yanukovych has also given his name to a collective term for blunders made by Ukrainian politicians: Yanukisms.

Viktor Yanukovych was born in the village of Zhukovka near Yenakiieve in Donetsk Oblast, Ukrainian SSR, Soviet Union. Of his childhood he has written: "My childhood was difficult and hungry. I grew up without my mother, who died when I was two. I went around bare-footed on the streets. I had to fight for myself every day.

Yanukovych is of Russian, Polish and Belarusian descent. Yanukovych is a surname of Belarusian origin, Yanuk being a derivative of the Catholic name Yan ("John"). His mother was a Russian nurse and his father, Fyodor Yanukovych, was a Polish-Belarusian locomotive-driver, originally from Yanuki [pl] in the Dokshytsy Raion of the Vitebsk Region which is in present-day Belarus. On various occasions, Yanukovych's family has been dogged by accusations that Fyodor Yanukovych was a member of the Schutzmannschaft during World War II, in particular claims by members of the Yulia Tymoshenko Bloc, which included documents from the NKVD supposedly revealing his involvement with the Schutzmannschaft. However, it has also been stated by residents of Yanuki that Yanukovych's family left for the Donbas before 1917, and that the collaborator Fyodor Yanukovych was an unrelated individual. Others, particularly members of the Party of Regions, have claimed that the documents were a falsehood with the intention of disparaging Yanukovych ahead of elections.

By the time he was a teenager, Yanukovych's father had remarried. However, Viktor left home due to conflicts with his stepmother, and was brought up by his Polish paternal grandmother, originally from Warsaw. His grandfather and great-grandparents were Lithuanian-Poles. Yanukovych has half-sisters from his father's remarriage, but has no contact with them.

In 1971, Yanukovych married Lyudmyla Nastenko a niece of Yenakiyeve city judge Oleksandr Sazhyn.