Hussainganj is a community development block and a town in district of Siwan, in Bihar state of India.

The headquarters of the block is at Hussainganj town.

The total area of the block is 85.37 square kilometres (32.96 sq mi) and the total population of the block as of the 2011 census of India is 1,82,794.

[1] The block is divided into many gram panchayats and villages.

[2] This article related to a location in Bihar is a stub.