| Oum Chheang Sun | |
| Native Name: | Central Khmer: អ៊ុំ ឈាងស៊ុន |
| Office: | Prime Minister of Cambodia |
| Term Start: | 5 January 1956 |
| Term End: | 29 February 1956 |
| Predecessor: | Norodom Sihanouk |
| Successor: | Norodom Sihanouk |
| Term Start1: | 3 March 1951 |
| Term End1: | 12 October 1951 |
| Monarch1: | Norodom Sihanouk |
| Predecessor1: | Sisowath Monipong |
| Successor1: | Huy Kanthoul |
| Office2: | President of the Council of Kingdom |
| Term Start2: | January 1950 |
| Term End2: | February 1952 |
| Predecessor2: | Khuon Nay |
| Successor2: | Penn Nouth |
| Birth Date: | 1 June 1900 |
| Birth Place: | Kampong Cham, Cambodia, French Indochina |
| Death Date: | 1963 (aged 62–63) |
| Party: | Sangkum |
Oum Chheang Sun (Central Khmer: អ៊ុំ ឈាងស៊ុន; 1 June 1900 – 1963) was Prime Minister of Cambodia from March to October 1951, and again from January to February 1956.[1]