Darbhanga Raj Fort, also known as Darbhanga Raj Palace or Quila, is a historic fort complex located in Darbhanga, Bihar. It was the seat of the powerful Darbhanga Raj, one of the most influential zamindari estates in eastern India. The fort reflects the political, cultural, and administrative importance of the Mithila region during the colonial and pre-colonial periods. The complex includes palaces, courtyards, temples, and administrative buildings spread over a large area. Its architecture shows a blend of traditional Indian and colonial styles. The Darbhanga Raj played a major role in promoting education, culture, and Maithili language. The fort area is closely linked with the history of Mithila and its rulers. Darbhanga Raj Fort remains an important heritage landmark of north Bihar.