Sisowath Monivong (Khmer: ស៊ីសុវត្ថិ មុនីវង្ស, Sisŏvôtthĕ Mŭnivôngs [ˈsiːsoʋat muˈniːʋɔŋ];[1] 27 December 1875 – 24 April 1941) was the King of Cambodia from 9 August 1927 until his death in 1941.

His full regnal title and style was Preah Bat Samdech Preah Serey Monivarman Krom Luang Chao Chakrabangsa Sisowath Monivong Ney Preah Reacheanachak Kampuchea (Khmer: ព្រះបាទសម្តេចព្រះសិរីមុនីវរ្ម័នក្រុមហ្លួងចៅចក្របាងស្ស ស៊ីសុវត្ថិ មុនីវង្ស នៃព្រះរាជាណចក្រកម្ពុជា) which can be literally translated from Khmerized Sanskrit as "His majesty, glorious lord scholar-protector; His highness, lord of land and sea, Sisowath Monivong of the Kingdom of Kampuchea".

[2] His mother was Neak Moneang Van, later titled Samdeach Preah Voreachini, the fifth child-bearing wife of Sisowath.

The royal family then moved from Oudong to the new capital of Phnom Penh, where Sisowath Monivong resided.

In 1904, both of his uncles and his elder brother Essaravong died, resulting in Sisowath Monivong becoming the Crown Prince of Cambodia.

These services were recognized with the Cross of Commander of the Foreign Legion and the Cambodian title of Samdech Preah Keofea.

In 1930, the Vietnamese leader Ho Chi Minh founded the Indochinese Communist Party which subsequently obtained popularity in Cambodia.

In the late 1930s, a powerless Monivong noticed that Imperial Japan was making inroads in Vietnam.

As the Japanese and Thai oppression of Cambodians became evident, Sisowath Monivong retired to Kampot in late 1941 and died at Bokor the same year.