Rajnagar is a census town situated in the Rajnagar CD block within the Suri Sadar subdivision of Birbhum district in the Indian state of West Bengal. Once the capital of Royal Kingdoms in the area, Rajnagar's significance declined with the fading away of the kingdoms.

Rajnagar is a community development block that forms an administrative division in Suri Sadar subdivision of Birbhum district in the Indian state of West Bengal.