Ram Sundar Das (; 9 January 1921 – 6 March 2015) was an Indian politician and a former Chief Minister of Bihar state. He was a leader of the Janata Dal (United) political party. He was the Chief Minister of Bihar from 21 April 1979 to 17 February 1980. In 1991, he was elected to the 10th Lok Sabha from Hajipur constituency in Bihar.