Rajendra Singh Tomar (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. Rajju Bhaiya worked as a professor and head of the Department of Physics at University of Allahabad but left the job to devote his life to the RSS in the mid-1960s.