Tata Castle, Medieval castle near Lake Öreg in Tata, Hungary

Tata Castle stands on the northern tip of Lake Öreg as a two-part stone complex. The surviving southeast wing, with pale ashlar walls, a steep gabled roof and a large central arched window, adjoins a taller square tower of rough grey-brown masonry with narrow arched openings and a low-pitched roof. In front stands a carved stone group of a figure beside a rearing animal.

Sigismund of Luxembourg had the castle built between 1397 and 1409, probably on the site of a 14th-century Lackfi stronghold. In the 1470s–1480s Matthias Corvinus rebuilt it with a two-storey arcaded courtyard and an arcaded terrace facing Lake Öreg. After 1543 it became a border fortress in the Ottoman wars, changing hands repeatedly until the Esterházy family acquired it in 1727.

The castle's name in Hungarian is Tata vára, after the town on Lake Öreg. Sigismund of Luxembourg used it as a favoured residence, and Mátyás Hunyadi rebuilt it in the 1470s–1480s as a Renaissance castle where he rested each spring. The Esterházy family, owners from 1727 to 1945, kept their archives and collections in the upper floors of the steward's house by the gate.

The main entrance is reached by Fellner Jakab's 1755 four-arch bridge over the moat, leading to a red-marble-framed gateway. The castle stands on the northern tip of Lake Öreg, with paths along the shore. Only the southeast wing and the excavated foundations of the other wings remain, so allow time to walk the grounds.

The castle appears in the 2017 Bollywood film Raabta and in the Netflix series The Witcher, which used its walls and courtyard as a set. The southeast wing and the chapel wall are the only parts still standing from Sigismund's 1397–1409 building; the rest survives as excavated foundations.