Suth Dina, former ambassador to South Korea, who was jailed for abuse of power and unlawful exploitation in 2016 has been freed after spending about four years in prison.
He was freed following a pardon signed by King Norodom Sihamoni on Tuesday.
According to a Royal Decree, Mr Dina, 45, had been found guilty of graft and sentenced to five years in prison.
He was an official with the Ministry of Foreign Affairs and a personal adviser to Prime Minister Hun Sen before being appointed the ambassador to South Korea in 2014.
Mr Dina was arrested and jailed in 2016 after the Anti-Corruption Unit investigated him for graft when his personal wealth suddenly ballooned.
His wealth reportedly increased by as much as $3 million during his time in South Korea.