Dhamdaha is an assembly constituency in Purnia district in the Indian state of Bihar.

Leshi Singh is the current MLA from Dhamdaha.

[1] As per Delimitation of Parliamentary and Assembly constituencies Order, 2008, No 61.

Dhamdaha Assembly constituency is composed of the following: Dhamdaha community development blocks; Banbhag Chunapur, Bithnouli Khemchand East, Bithnouli Khemchand West, Ganeshpur, Gangaili, Gowasi, Kajha, Majra, Parora, Rahuwa, Sahara, Satkodariya, Gokulpur, Jagni and Pothia Rampur of Krityanand Nagar CD Block.

Dhamdaha High school one of the oldest has reputation of giving notable officers to the state and country.