Ajit Kumar Singh[1] also known as Ajit Kumar Kushwaha[2][3] is an Indian politician and a Member of the Bihar Legislative Assembly from the Dumraon Assembly constituency.

Singh has been elected to assembly as a candidate of Communist Party of India (Marxist-Leninist) Liberation.

Singh won the tripolar contest, in which apart from JDU's Anjum Ara, former Member of Legislative Assembly from Dumraon, Dadan Pahalwan was also a participant.

Singh was a former president for the state of Bihar, of the Revolutionary Youth Association and a former secretary for the state of Bihar of All India Students Association.

He completed his doctoral studies in the "history of farmer's agitation" from the Veer Kunwar Singh University and started taking part in political activism, before being elected as a member of the legislative assembly in 2020.