Prince Fatafehi Tuʻipelehake (Sione Ngū Manumataongo; 7 January 1922 – 10 April 1999)[1] was the youngest son of Queen Sālote Tupou III of Tonga.

He was the prime minister of Tonga from 1965 to 1991, a record tenure of over 25 years, serving under his brother King Tāufaʻāhau Tupou IV.

[3] On 10 June 1947, Fatafehi married Melenaite Tupoumoheofo Veikune [to] (13 November 1924 – 16 March 1993) in a double marriage ceremony (taʻane māhanga) with his older brother, the Crown Prince (at the time known as Tupoutoʻa-Tungī), who also married Halaevalu Mataʻaho ʻAhomeʻe.

His first assignment was as governor of Vavaʻu (1949–1952), later of Haʻapai (1952–1953), and he then served as Minister of Health and Lands.

He remained prime minister until he resigned in 1991 due to serious health problems.