Rajiv Ranjan Singh alias Lalan Singh is an Indian politician and Member of Parliament representing Munger in the 17th Lok Sabha from Janata Dal (United). He was the national party president of JDU from 31 July 2021 to 29 December 2023. He was also the former JD(U) Bihar unit President.

The 17th Lok Sabha was formed by the members elected in the 2019 Indian general election. Elections, all across India, were conducted in seven phases from 11 April 2019 to 19 May 2019 by the Election Commission of India. Counting started officially on the morning of 23 May 2019 and the results were declared on the same day.