Orthodox Christianity was brought to Cambodia by the Russian immigrants at the end of 20th century. However, for many years they were praying at home, not having a church or a priest. Things started to change in November 2001, when His Eminence Metropolitan Kirill (now Patriarch of Moscow and All Russia), Chairman of the Department of External Affairs of Moscow Patriarchate visited Cambodia. 

During this visit Metropolitan Kirill met with His Majesty Norodom Sihanouk, King of Cambodia. A warm and friendly conversation took place. In particular, Metropolitan Kirill spoke about the public service of the Russian Orthodox Church, its social and peacekeeping initiatives, and inter-religious cooperation. His Majesty praised the activity of the Russian Church as well as the spiritual transformation of the Russian society. His Majesty asked Metropolitan Kirill to convey his deep and sincere gratitude to the President and Government of the Russian Federation, as well as the people of Russia who have always provided effective support to the Cambodian people in overcoming the economic difficulties and consequences of the civil conflict.

Since 2001 the pastoral care for the Orthodox Christians in the Kingdom of Cambodia was entrusted to the Representation of the Russian Orthodox Church in Thailand. For more than 12 years the Representation was occasionally sending priests to Cambodia, especially for the celebration of the divine services of Nativity (Christmas) and Pascha (Easter). But the first permanent priest was appointed in August 2014.

The Royal Government of Cambodia, through the Ministry of Cults and Religions has registered the Orthodox Church in the Kingdom by its letter No. 234/13 SSR dated July 3, 2013.

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An article about Orthodoxy in Cambodia

https://orthochristian.com/147815.html