Rajendra Singh (????????? ???? ?????, 29 January 1922 – 14 July 2003 ), popularly called Rajju Bhaiya, was the fourth Sarsanghchalak of the Rashtriya Swayamsevak Sangh (RSS).
He was chief of that organisation between 1994 and 2000.
Rajendra Singh was the first non-Maharashtrian and non - Brahmin Sarsanghchalak of the RSS.He worked as a professor and head of the Department of Physics at Allahabad University but left to devote his life to the RSS in the mid-1960s.