Chey Chettha III (Khmer: ជ័យជេដ្ឋាទី៣; 1639–1673) or Batom Reachea II was a Cambodian king from 1672 to 1673.
[citation needed] Chey Chettha III was the only son of Batom Reachea.
In 1671, he became the son-in-law of his uncle, King Barom Reachea V, by marrying his eldest daughter, Princess Sri Thida Kshatriyi.
[citation needed] In December 1672, he murdered his father-in-law and seized the throne, and forced his cousin Bhagavatti Dav Kshatriyi (also the wife of his uncle Prince Ang Tan) to be his wife.
[citation needed] Chey Chettha III was assassinated by the Chams and Malays in the employ of his wife, Gama Kshatriyi, just five months after his coronation, in April (or May) 1673.