Sivakant Tiwari, Indian-Singaporean politician (b. 1945)
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 delegation which established diplomatic relations between Singapore and the People's Republic of China. He was also on Singapore's legal team in a case concluded in 2003 that had been brought by Malaysia to the International Tribunal for the Law of the Sea for provisional measures against alleged damage to its territorial waters due to land reclamation by Singapore, and in the territorial dispute with Malaysia over Pedra Branca before the International Court of Justice in 2007.

Tiwari retired from the Legal Service in 2007 but was re-employed by the Attorney-General's Chambers as a special consultant, and in that year was appointed by the World Trade Organization as a panellist for the first international adjudication of enforcement provisions in the Agreement on Trade-Related Aspects of Intellectual Property Rights in a dispute between China and the United States. He later became a senior visiting fellow at the Institute of Southeast Asian Studies. The founding president of the Hindi Society (Singapore) in 1990, he continued acting as principal of the Society's Hindi Centres in his retirement.

Tiwari was a recipient of the Pingat Pentadbiran Awam (Emas) (Public Administration Medal (Gold), 1984), the Pingat Bakti Setia (Long Service Award, 1996), the Public Administration Medal (Gold) (Bar) (2000), and the Pingat Jasa Gemilang (Meritorious Service Medal, 2008).