Kastelo de Várpalota, Historical castle museum in Várpalota, Hungary.

Kastelo de Várpalota is a one-storey Baroque castle built between 1721 and 1725 for Count Imre Zichy II and his wife Terézia Erdődy, rebuilt in classicist-romantic style by Miklós Ybl after a fire in 1860. Its asymmetric facade centres on the main entrance with an open grated balcony above, and an oval truncated tower with no function but ornament rises from the roof. Inside, the former chapel now serves as the entrance hall, and the oval wooden-panelled library holds a ceiling fresco copy by Béla Pállik after Guido Reni.

The Baroque castle was built between 1721 and 1725 for Count Imre Zichy II, főispán of Árva County, and his wife Terézia Erdődy; its chapel was consecrated in 1727. After a fire in 1860, Count János Waldstein had it rebuilt in 1863 in classicist-romantic style to plans by Miklós Ybl. The army took ownership in 1913, and after damage in 1945 the Ministry of Defence restored it in 1954 following Ybl's original designs. A Trianon museum opened in 2004 and, after full renovation from 2017, reopened on 22 September 2023.

The museum's name comes from the 1920 Treaty of Trianon, and its permanent exhibitions carry titles such as "Vagonba zárt nemzet" (A Nation Locked in Wagons) and "Civitas fortissima", about Balassagyarmat. Visitors from territories detached from Hungary after 1920 enter free of charge. The building also hosts events and research supporting Hungarian communities across the Carpathian Basin.

The site is easy to explore on foot and exhibitions are clearly marked throughout. Visitors should allow enough time to see all collection areas, especially if interested in the different exhibition sections within the building.

The oval library room holds a copy of Guido Reni's fresco of Apollo, Aurora and the Hours, painted by Béla Pállik, a regular summer guest in the 1860s; the original is in Rome's Palazzo Rospigliosi. The books and side frescoes were lost, but Pállik's ceiling painting survives.