Qasr Al Muwaiji, Historical castle in Al Ain, United Arab Emirates

Qasr Al Muwaiji is a square clay fortress in Al Ain, built with guard towers at the corners. The complex contains multiple rooms for living and administration that showcase traditional building methods and local materials.

Qasr Al Muwaiji was built in the early 20th century by Sheikh Khalifa bin Zayed bin Khalifa Al Nahyan during the reign of his father, Sheikh Zayed the First. In 1946 Sheikh Zayed bin Sultan Al Nahyan became the Ruler's Representative in Al Ain and moved into the fort, which became his diwan and family home; two years later his eldest son Sheikh Khalifa was born there. Sheikh Zayed enlarged the diwan, kitchens and guest rooms before moving to Abu Dhabi in 1966. After years of disuse and use as a date-palm farm, the restored fort opened as a museum in 2015.

The fort's name comes from the adjacent Al Muwaiji oasis, the smallest of Al Ain's oases, on the road to Abu Dhabi. It served as a diwan where Sheikh Zayed bin Sultan Al Nahyan received the community after 1946, and its museum displays rare photographs of Sheikh Khalifa bin Zayed and the Al Nahyan family chronology.

The fort stands on the western edge of Al Ain beside Al Muwaiji, the smallest of the city's oases, on the road toward Abu Dhabi. Its square enclosure measures 65 by 65 metres, with projecting towers at the north-west and south-east corners and the gate set in the middle of the south wall facing the oasis. The museum opened in 2015 after restoration.

Archaeological digs at Al Muwaiji found a copper coin dated 1897, indicating the fort was built after that year. Excavations also suggest the site was settled between the 17th and 19th centuries, before the fort existed. The fort later served for years as a date-palm farm.