Sione Ngongo Kioa

Sione Ngongo Kioa (born 14 April 1959) is a Tongan diplomat and civil servant. From 2013 to 2022 he served as governor of National Reserve Bank of Tonga.

After graduating from Tailulu College, Ngongo attended the University of the South Pacific in Suva, Fiji, where he studied mathematics and economics,

From 1992 to 1996 Ngongo was the Deputy Director of Central Planning, and from 1996 to 1999 he served in Washington, D.C. as Assistant Executive Director at the International Monetary Fund. After returning to Tonga in 2001, he was appointed as the Director of Fiscal and Economic Policies at the Ministry of Finance. In 2002 he became the Project Manager of the Reconstruction and Rehabilitation Operation of Cyclone Waka. He was also concurrently accredited as Ambassador Extraordinary and Plenipotentiary of Tonga to the Russian Federation, Germany, Denmark, Italy, Luxembourg, Switzerland, Belgium, and the European Union.

Effective 21 August 2013, Ngongo was appointed Governor of the National Reserve Bank of Tonga, the central bank. His first term lasted until 2018. He stepped down in October 2022. Since 1 March 2022, he has been Chairman of the Shared Board Transport Sector.

Honours National honours 50px Order of Queen Sālote Tupou III, Grand Cross (31 July 2008).