Barh Assembly constituency is one of 243 constituencies of legislative assembly of Bihar. It comes under Munger Lok Sabha constituency along with other assembly constituencies. Barh is in the 14 assembly segments which fall under Patna district.
Barh comprises CD Blocks Athmalgola, Belchi & Barh; Gram Panchayats Dhiwar, Parsawan, Goasa Shekhpura & Bihari Bigha of Pandarak CD Block.