Rajmahal Assembly constituency is one of the 81 Legislative Assembly constituencies of Jharkhand state in eastern India. This constituency covers Rajmahal and Sahebganj Police Stations in Rajmahal sub-division of the district.
Rajmahal (constituency number 1) is one of the three Jharkhand Legislative Assembly constituencies in Sahebganj district. It is one of the Assembly segments of the Rajmahal Lok Sabha constituency along with 5 other segments, namely, Borio and Barhait in this district and Litipara, Pakur and Maheshpur in Pakur district.