Rajendra Singh (born 6 August 1959) is a well-known Water Conservationist from Alwar, Rajasthan (India). He is the Founder of an NGO called Tarun Bharat Sangh (TBS). The NGO has been instrumental in fighting the slow bureaucracy and has helped villagers take charge of water management in their areas, through the use of check dams and other time-tested as well as path-breaking techniques. This NGO played a vital role in reviving Arvari River. Activities of the TBS are spread over an area of 6,500 sq km, which includes parts of Madhya Pradesh, Gujarat and Andhra Pradesh. Rajendra Singh, the man who ‘divined’ water in the arid regions of eastern Rajasthan, has built about 4,500 earthen check dams or johads, to collect rainwater in around 850 villages across 11 districts in the State since 1985. The TBS has also helped revive 5 rivers that had gone dry.