The Visegrád Group, also called the Visegrád Four or V4, is an alliance of four Central European states – Czech Republic, Hungary, Poland and Slovakia – for the purposes of cooperation and furthering their European integration. The Group's name in the languages of the four countries is Visegrádská čtyřka or Visegrádská skupina (Czech); Visegrádi Együttműködés or Visegrádi négyek (Hungarian); Grupa Wyszehradzka (Polish); and Vyšehradská skupina or Vyšehradská štvorka (Slovak). It is also sometimes referred to as the Visegrád Triangle, since it was an alliance of three states at the beginning – the term is not valid now, but appears sometimes even after all the years since the dissolution of Czechoslovakia in 1993.

The Group originated in a summit meeting of the heads of state or government of Czechoslovakia, Hungary and Poland held in the Hungarian castle town of Visegrád on 15 February 1991 (not to be mistaken with Vyšehrad, a castle in Prague, the capital city of the Czech Republic, or with the town of Višegrad in Bosnia and Herzegovina).

Visegrád (pronounced [ˈviʃɛɡraːd], Slovak: Vyšehrad) is a small castle town in Pest County, Hungary.

Situated north of Budapest on the right bank of the Danube in the Danube Bend, Visegrád has a population 1,654 as of 2001. Visegrád is famous for the remains of the Early Renaissance summer palace of King Matthias Corvinus of Hungary and the medieval citadel.

The name Visegrád (Vyšehrad) is of Slavic origin meaning "the upper castle" or "the upper settlement/town/fortification". In modern Slovak and Czech the spelling is Vyšehrad. There is a town in Bosnia and Herzegovina with the same name - Višegrad, famous for its Mehmed Paša Sokolović Bridge.

In German, the town is called Plintenburg.

Visegrád was first mentioned in 1009 as a county town and the chief town of an archdeaconry. After the destructive Mongol invasion of Europe in 1242, the town was rebuilt in a slightly different location to the south. King Charles I of Hungary made Visegrád, his hometown, the royal seat of Hungary in 1325.

In 1335, Charles hosted at Visegrád a two-month congress with the Bohemian king, John of Luxembourg, and the Polish king, Casimir III. It was crucial in creating a peace between the three kingdoms and securing an alliance between Poland and Hungary against Habsburg Austria. Another congress followed in 1338.