The Senate of Cambodia (ព្រឹទ្ធសភានៃព្រះរាជាណាចក្រកម្ពុជា, Protsaphea) is the upper house of the Parliament of Cambodia.

According to the Constitution of the Kingdom of Cambodia, The Senate is a body that has legislative power and performs its duties as determined in the constitution and law. The Senate consists of 58 members that the number of which does not exceed half of all of the members of the Assembly. As stated in the constitution, two Senators will be nominated by the King and two will be elected by the National Assembly of Cambodia, the rest will be elected by the 24 provinces of Cambodia.

The Senate is led by a 12-person permanent commission (bureau), which is in turn chaired by the President of the Senate, (as of 2012) Chea Sim. He is assisted by a First and a Second Vice-President. The President and Vice Presidents are elected as the first item of business at the start of every legislative session.

Cambodia’s first Senate Election was held on January 22, 2006. The election was non-universal in nature because only commune councillors and members of the National Assembly were allowed to participate, voting on behalf of their constituents.

Cambodia (ⁱ/kæmˈboʊdiə/;Khmer: ព្រះរាជាណាចក្រកម្ពុជា, Kampuchea, IPA: [kɑmˈpuˈciə]), officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia. With a total landmass of 181,035 square kilometres (69,898 sq mi), it is bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, and the Gulf of Thailand to the southwest.

With a population of over 14.8 million, Cambodia is the 68th most populous country in the world. The official religion is Theravada Buddhism, which is practiced by around 95% of the Cambodian population. The country minority groups include Vietnamese, Chinese, Chams and 30 various hill tribes. The capital and largest city is Phnom Penh; the political, economic, and cultural center of Cambodia. The kingdom is a constitutional monarchy with Norodom Sihamoni, a monarch chosen by the Royal Throne Council, as head of state. The head of government is Hun Sen, who is currently the longest serving leader in South East Asia and has ruled Cambodia for over 25 years.

Hun Sen (Khmer: ហ៊ុន សែន; born 5 August 1952) is the current Prime Minister of Cambodia and leader of the Cambodian People's Party (CPP), which has governed Cambodia since the Vietnamese-backed overthrow of the Khmer Rouge in 1979. Since the restoration of multi-party democracy in 1993, the CPP has been in a coalition with the royalist Funcinpec party.

His current, full, honorary title is Samdech Akeak Moha Sena Padei Techo Hun Sen (Khmer: សម្តេចអគ្គមហាសេនាបតីតេជោ ហ៊ុន សែន). The title "Samdech" was attached to his name in 1993 by King Norodom Sihanouk. It is only an honorary title and does not give him further powers. He has a glass eye, the result of a wound sustained during the Khmer Rouge offensive against Phnom Penh in April 1975. Hun Sen is currently the longest serving leader in South East Asia and is one of the longest serving prime ministers in the world, having been in power through various coalitions since 1985.

Hun Sen came to power with the Khmer Rouge and served as a Battalion Commander in the Eastern Region of Democratic Kampuchea (previous name of Cambodia). After falling out with the Khmer Rouge Hun Sen fled to Vietnam. Hun Sen was selected by the Vietnamese for a leadership role in the rebel army and government they were creating for Cambodia. When the Khmer Rouge regime was overthrown, Hun Sen was appointed as Foreign Minister of the Vietnamese-installed People's Republic of Kampuchea/State of Cambodia (PRK/SOC) in 1979 and in 1985 he was made Chairman of the Council of Ministers and Prime Minister, after the death of Chairman Chan Sy until 1990, (with a brief interruption from 1986 until 1987). As Foreign Minister, Hun Sen was a key figure in the Paris Peace Talks, which brokered peace in Cambodia.

Saloth Sar (19 May 1925 – 15 April 1998), better known as Pol Pot (Khmer: ប៉ុល ពត), was a Cambodian Maoist revolutionary who led the Khmer Rouge from 1963 until his death in 1998. From 1963 to 1981, he served as the General Secretary of the Communist Party of Kampuchea. From 1976 to 1979, he also served as the prime minister of Democratic Kampuchea. Pol Pot became leader of Cambodia on April 17, 1975. During his time in power he imposed agrarian socialism, forcing urban dwellers to relocate to the countryside to work in collective farms and forced labor projects. The combined effects of forced labor, malnutrition, poor medical care, and executions resulted in the deaths of approximately 21% of the Cambodian population. In all, an estimated 1.7 to 2.5 million people (out of a population of slightly over 8 million) died as a result of the policies of his three-year premiership.

In 1979, after the Vietnamese invasion of Cambodia, Pol Pot fled to the jungles of southwest Cambodia, and the Khmer Rouge government collapsed. From 1979 to 1997, he and a remnant of the old Khmer Rouge operated near the border of Cambodia and Thailand, where they clung to power, with nominal United Nations recognition as the rightful government of Cambodia. Pol Pot died in 1998 while under house arrest by the Ta Mok faction of the Khmer Rouge. Since his death, rumours that he was poisoned have persisted.