Valmiki Nagar Lok Sabha constituency is one of the 40 Lok Sabha (parliamentary) constituencies in Bihar state in eastern India.

This constituency came into existence in 2008, following delimitation of the parliamentary constituencies based on the recommendations of the Delimitation Commission of India constituted in 2002.

This constituency comprises the following six Vidhan Sabha (legislative assembly) segments: ^ bye-poll Bye-elections were needed due to the death of the sitting MP, Baidyanath Prasad Mahto.

Sunil Kumar, Mahto's son won the by-election.

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