Sivakant Tiwari, P.P.A.(E.), P.B.S., P.P.A.(E.)(L.), P.J.G. (20 December 1945 – 26 July 2010), known professionally as S. Tiwari, was a senior legal officer of the Singapore Legal Service. He was educated at the University of Singapore, graduating in law in 1971. He then made the Legal Service his career, serving as head of the Ministry of Defence's legal department (1974), and head of the Attorney-General's Chambers' Civil Division (1987) and International Affairs Division (1995). He was lead counsel in three significant commissions of inquiry arising out of fatal incidents in the 1970s and 1980s. A skilled negotiator, Tiwari was a member of the Singapore delegation which dealt with the United States – Singapore Free Trade Agreement signed in 2003, and served as legal adviser to the deleg