The National Reserve Bank of Tonga (NRBT; Tongan: Pangikē Pule Fakafonua ʻo Tongá) is the central bank of Tonga. The Reserve Bank is responsible for regulating the issue and supply of domestic and international currency, as well as promoting monetary stability and economic development. It also advises the Ministry of Finance on banking and monetary matters, acts as the principal banker and fiscal agent of the Government of Tonga, and is responsible for the licensing and supervision of financial institutions. The current Governor is Tatafu Moeaki who succeeded Ngongo Kioa.

NRBT is active in promoting financial inclusion and is a member of the Alliance for Financial Inclusion.

NRBT Building hosts the Embassy of Japan.

NRBT Is the current tallest building in Tonga, standing at 18m (59 ft).

National Reserve Bank of Tonga was established on 1 July 1989. It was preceded as monetary authority and holder of foreign reserves by Bank of Tonga, which was established in 1974.

Governor of the bank is appointed for renewable five-year terms.