Penn Nouth (; April 15th 1906 â May 18th 1985) was a Cambodian politician. He served in the French colonial administration, then took active part in Cambodian politics, was several times Prime Minister of Cambodia (1953, 1954–1955, 1958, 1961) as part of the Sangkum regime of Prince Norodom Sihanouk. He was the first prime minister of an independent Cambodia. He was prime minister for the sixth time from 31 January 1968 to August 14th1969. On March 18th 1970, when Norodom Sihanouk was deposed by Penn Nouth's successor Lon Nol, Penn Nouth joined the monarch in his exile and became prime minister in the GRUNK coalition. His combined tenure as prime minister (5 years, 222 days), spanning seven non-consecutive terms, is the second-longest in Cambodian history after Hun Sen.
On April 17th, 1975, when the Khmer Rouge took power, he held the post of prime minister for the last time, until April 4, 1976, but without holding any power, Democratic Kampuchea being entirely controlled by Pol Pot's supporters. He was subsequently placed under house arrest, like Norodom Sihanouk, until January 6, 1979, when, following the Vietnamese invasion, he returned to the People's Republic of China.
He emigrated to France, to Châtenay-Malabry, where he obtained refugee status on March 6, 1981, and where he died on May 18, 1985, at age 79.