Jai Kumar Singh is an Indian politician from Rohtas district of Bihar, India.

[1][2] He served as Minister of Department of Science and Technology, Bihar and is Member of Bihar Legislative Assembly representing Dinara vidhan sabha constituency since 2005.

[3][4] Singh made entry into politics in 2001 as member of Rohtas district council.

In 2005 Bihar Legislative Assembly election, he won from Dinara Vidhan sabha constituency.

He also held the position as Minister of Cooperative Department of Government of Bihar in 2014.