Gellért Hill is a 235 m (771 ft) high hill overlooking the Danube in Budapest, Hungary. It is located in the 1st and the 11th districts. The hill was named after Saint Gerard who was thrown to death from the hill. The famous Hotel Gellért and the Gellért Baths can be found in Gellért Square at the foot of the hill, next to Liberty Bridge. The Gellért Hill Cave is also located on the hill, facing the hotel and the Danube.

At the top of the hill, the Citadella can be found with a nice panoramic view of the city.

Now an affluent residential area, a number of embassies and ambassadorial residences line the streets that wind up the hill. Since 1987, the area has been a UNESCO World Heritage site as part of “the Banks of the Danube”.

A large proportion of the hill consists of parkland. Bats and hedgehogs are commonly observed on summer nights.

In January 2007, a new cave was discovered under Gellért Hill during private construction. The cave is 60 m long and 18 m deep with three rooms. The interior is covered with dazzling white crystals composed of gypsum, calcite, and aragonite. The cave was created 300,000–500,000 years ago by a now disappeared thermal spring. The crystal cave was immediately placed under legal protection.