Sinnathamby Rajaratnam DUT (Tamil: சின்னத்தம்பி ராஜரத்னம்; 25 February 1915 – 22 February 2006), better known as S. Rajaratnam, was a Singaporean politician who served as Deputy Prime Minister of Singapore between 1980 and 1985. Rajaratnam is widely recognized as one of the founding fathers of Singapore. He was also one of the founders of the People's Action Party (PAP), which has governed the country continuously since independence. The S. Rajaratnam School of International Studies at the Nanyang Technological University and the S. Rajaratnam block of Raffles Institution are named after him.