Revište, Castle ruin in Žarnovica, Slovakia.

Revište is a castle ruin on a narrow rocky ridge above the Hron River, in the Žarnovica district of Slovakia. The structure follows the shape of the ridge from end to end, with a prism-shaped tower at its northern tip and stretches of defensive wall still standing.

Revište was built in the second half of the 13th century alongside Šášov, 18 km away, to guard the trade route to the mining towns of Banská Štiavnica and Kremnica. In the 1440s it was held by Ján Jiskra's brotherhood garrison; Matthias Corvinus took it in 1467. Badly damaged around 1679 during Thököly's uprising, it was repaired and later served as army barracks before being abandoned at the end of the 18th century.

The castle's name appears in 14th-century records as Reuisce, Ryuche and Revistye. The Dóczy family, its longest holders, used it as a base for raids on the mining towns; the last Dóczy lord, Žigmund, was beheaded by the Turks after they took Žarnovica on 4 August 1647.

Marked hiking trails start from the center of Žarnovica and lead up to the ruins, making the route easy to follow for most walkers. Sturdy footwear is a good idea, as the rocky ridge can be uneven underfoot.

The courtyard of the castle is so narrow along its length that it resembles a corridor more than a typical medieval yard. This shape was not a design choice but a direct result of the ridge itself, which left almost no room to build sideways.