There are many public holidays in Cambodia, these are 4 of the most important out of 17.
Khmer New Year - April 14-16
This national holiday was established to celebrate the New Year in Cambodia.
King Sihamoni's Birthday - May 13-15
This national holiday was established to celebrate the birthday of HM King Norodom Sihamoni on May 14, 1953.
Pchum Ben Festival - September 26-28
This national holiday was established for buddhist to pay their respects to deceased relatives by cooking meals for monks and making offerings to the "ghost" of deceased relatives. It is also known as "Ancestor's Day".
Water Festival - Late November
This national holiday was established to celebrate the time when the water in the Mekong and Tonle Sap river changes course.