| Nhek Bun Chhay | |
| Office: | Leader of the Khmer National United Party |
| Term Start: | 2016 |
| Office1: | Member of Parliament |
| Constituency1: | Battambang (1993–2008) Banteay Meanchey (2008–2013) |
| Term Start1: | 2 July 1993 |
| Term End1: | 28 July 2013 |
| Office2: | Deputy Prime Minister of Cambodia |
| Monarch2: | Norodom Sihanouk Norodom Sihamoni |
| Primeminister2: | Hun Sen |
| Term Start2: | 16 July 2004 |
| Term End2: | 24 September 2013 |
| Office3: | Second Vice President of the Senate |
| President3: | Chea Sim |
| Term Start3: | 1999 |
| Term End3: | 2003 |
| Birth Place: | Battambang, Cambodia |
| Party: | Khmer National United Party |
| Spouse: | Sam Sopheap |
| Alma Mater: | St. Clements University |
| Profession: | Politician |
| Native Name Lang: | km |
Nhek Bun Chhay (Central Khmer: ញឹក ប៊ុនឆៃ; born 1956) is a Cambodian politician and leader of the Khmer National United Party. Prior to his career in the military, he began as a rebel and supported the royalist forces of Funcinpec until he rose to the rank of general.[1] He began his career as a politician after the downfall of FUNCINPEC and founded his own political party.