Monghyr, Mungeralso spelled Munger, town, administrative headquarters of Monghyr district, Bihār Monghyrcity, Bihar state, northeastern India, on the Ganges (Ganga) River. Monghyr Munger is said to have been founded by the Guptas (4th century AD CE) and contains a fort that houses the tomb of the Muslim saint Shāh Shah Mushk Nafā (died 1497). In 1763 Mīr Qasīm, nawab of Bengal, made Monghyr Munger his capital and built an arsenal and several palaces. It was constituted a municipality in 1864.

With major rail, road, and ferry-steamer connections, it is an important grain market. Industries include the manufacture of firearms and swords and ebony work. The town city contains one of the largest cigarette factories in India. To the southeast is the pilgrimage site and thermal springs of Sītākund.Monghyr district (3,061 sq mi [7,928 sq km]) consists of alluvial plains stretching south of the Ganges River. In the far south are the forested Kharagpur hills, rising to 1,607 ft (490 m) at Ambinath, and parts of the Choṭa Nāgpur Plateau. Rice, corn (maize), wheat, gram, and oilseeds are the chief crops; mica, slate, and limestone deposits are worked. Jamālpur and Simaltala are important rail and commercial centres. Pop. (1991) town, 150,112; district, 3,060,027Sitakund. Pop. (2001) 188,050.