| Honorific-Prefix: | His Excellency Samdech Vibol Sena Pheakdey |
| Say Chhum | |
| Office: | 3rd President of the Senate |
| Term Start: | 9 June 2015 |
| Term End: | 3 April 2024 |
| Successor: | Hun Sen |
| Predecessor: | Chea Sim |
| Office1: | Vice President of the Cambodian People's Party |
| Alongside1: | Sar Kheng, Tea Banh and Men Sam An, and Hun Manet |
| Term Start1: | 20 June 2015 |
| President1: | Hun Sen |
| Predecessor1: | Hun Sen |
| Office2: | Second Vice President of the National Assembly |
| President2: | Heng Samrin |
| Term Start2: | 21 March 2006 |
| Term End2: | 25 April 2012 |
| Predecessor2: | Nguon Nhel |
| Successor2: | Khuon Sodary |
| Office3: | First Vice President of the Senate |
| Term Start3: | 24 March 2012 |
| Term End3: | 9 June 2015 |
| President3: | Chea Sim |
| Successor3: | Ney Pena |
| Constituency Mp4: | Kampong Speu |
| Term Start4: | 14 June 1993 |
| Term End4: | 24 March 2012 |
| Birth Date: | 5 February 1945 |
| Birth Place: | Kampong Cham, Cambodia, French Indochina |
| Party: | Cambodian People's Party |
| Children: | 3, incl. Say Sam Al |
Say Chhum (km|សាយ ឈុំ; born 5 February 1945) is a Cambodian politician who most recently served as the president of the Senate of Cambodia from 2015 to 2024. He was the first vice president of the Senate until June 2015, when he succeeded Chea Sim upon the latter's death. He served as the Chairman of the Permanent Committee of the Central Committee of the Cambodian People's Party.
He was elected to represent Kampong Speu Province in the National Assembly in 2003.[1] He also served as Second Vice-President of the National Assembly.
As First Vice-President of the Senate, Say Chhum served as acting Senate President when the ailing Chea Sim was absent. Shortly after Chea Sim's death, Say Chhum was unanimously elected as President of the Senate on 9 June 2015 by the 51 senators present.[2]
His son, Say Sam Al, was appointed Minister of the Environment in 2013.