New Year's Day is the first day of the year, in the Gregorian calendar, and falls exactly one week after the Christmas Day of the previous year.  New Year's Day is a public holiday in all countries that observe the Gregorian calendar.  This makes it the world's most widely observed public holiday.

This national holiday is always celebrated annually on January 7th.  Also known as Cambodian Victory Day, it marks the end of the Khmer Rouge regime in 1979.

No holidays in February sorry.

International Women's Day was first established at the 1910 International Socialist Women's Conference in Copenhagen. German women's rights activist and Marxist theorist Clara Zetkin was the one who tabled the idea.

Khmer New Year is a three-day public holiday. Like most New Year holidays, it is full of tradition and rituals. The three days of celebration each have their own name and associated traditions:



1st day of the Khmer New Year is believed that this was the day of creation.
2nd day of Khmer New Year is a time to think of the less fortunate. 

3rd day of New Year celebrations is that of cleansing.

This international holiday is observed on May 1st.  It is most commonly associated as a commemoration of the achievements of the labour movement.  The holiday may also be known as International Worker's Day or May Day and is marked with a public holiday in over 80 countries.

The King's Birthday is a national holiday in Cambodia observed on May 14th each year.  The  public holiday used to lasted for three days usually from May 13th to May 15th.   But since of 2020, the holiday was reduced to one day as part of a shake-up to reduce the number of holidays from 28 to 22. 

The date may vary if the day falls on a weekend.  The holiday was established to celebrate the Royal Birthday of His Majesty Preah Bat Samdech Preah Baromneath Norodom Sihamoni, the King of the Kingdom of Cambodia

Buddha Purnima is the most sacred day in the Buddhist calendar.  It is the most important festival of the Buddhists and is celebrated with great enthusiasm.

On Buddha Purnima, people dress in white clothes and give out kheer (a rice pudding) as, according to legend, a woman named Sujata once offered Gautam Buddha kheer on his birthday and it has since become a tradition.  The dharmacakra or dharma wheel is a symbol often seen during Vesak. It is a wooden wheel with eight spokes. The wheel represents Buddha's teaching on the path to enlightenment.  The eight spokes symbolize the noble eightfold path of Buddhism.

The Royal Plowing Ceremony in Cambodia is a beautiful and ancient tradition that marks the start of the rice-planting season. It's a time for Cambodians to come together to celebrate their agricultural heritage, pray for a bountiful harvest,

King Mother's Birthday is a public holiday in Cambodia on June 18th each year.  This day commemorates the birthday of Queen Mother Norodom Monineath in 1936.

Queen Mother Norodom Monineath was born on June 18th 1936 in Saigon, when it was part of French Indochina.  Her birth name was Paule-Monique Izzi and her father was French.  She was queen consort of Cambodia from 1952 to 1955 and again from 1993 to 2004, as the wife of King Norodom Sihanouk.  She first met Norodom Sihanouk in 1951 when he awarded her first prize in a beauty contest.  They married the following year.

There are no holiday Khmer holidays in July sorry.

There are no Khmer holidays in August sorry.

Constitutional Day is a public holiday in Cambodia on September 24th. This day commemorates the proclamation of the constitution on this day in 1993. 

Cambodia was brought to its knees by the infamous Khmer Rouge regime of Pol Pot in the 1970s. The despot's rule was followed by the Cambodian-Vietnamese War, which lasted until 1991 and the signing of the Paris Peace Agreements in October of that year.  An outcome of the agreements was that there would be a new constitution to help transition Cambodia into a modern, democratic country with a constitutional monarchy.

Pchum Ben, also known as Ancestors' Day, is a 15-day Cambodian religious festival, which culminates in celebrations on the 15th day of the tenth month in the Khmer calendar, marking the end of the Buddhist lent.

Phcum Ben starts on the first day of the waning moon in the month of Putrobut until the 15th day before the new moon.  Each of the the first fourteen days of the festival is called a day of Kan Ban.  The 15th and last day is called 'Pchum Ben' and is the start of a two day public holiday.  In Khmer, the language of Cambodia, Pchum means 'to gather together' and Ben means 'a ball of food'. 

Pchum Ben is the most important festival in the Khmer religious calendar. The day is a time for Cambodians to pay their respects to their ancestors of up to seven generations.

Commemoration Day of King’s Father is a public holiday in Cambodia on October 15th each year. The full title of this holiday is "Commemoration Day to the Royal Soul of His Majesty Preah Bat Samdech Preah Norodom Sihanouk, Preahmahaviraksat, King-Father of the Cambodian National Independence, Territorial Integrity and Unity."

King's Coronation Day is a public holiday on October 29th each year.  This holiday commemorates the anniversary of the King's coronation in 2004.

King Norodom Sihanouk had ruled various iterations of Cambodia since 1941.  In 2004, he surprised everyone when he announced his abdication due to ill health.  His Son, His Majesty King Norodom Sihamoni was made king after being chosen by a nine-member throne council to become the next king. 
 
Even though King Norodom Sihamoni's father was King, the King of Cambodia is an elected monarch, making Cambodia one of the few elected monarchies of the world.

This national holiday is celebrated on 9th November each year.  If 9 November falls on a Sunday, the following working day will be a holiday.  The holiday was established to celebrate the anniversary of Cambodia's independence from France on 9 November 1953 and is Cambodia's national holiday.

Bon Om Touk, also known as the Cambodian Water Festival, is a three day festival celebrated on the full moon in October or November.

The festival marks a reversal of the flow between the Mekong and Tonle Sap rivers.  Due to the amount of water deposited during the rainy season, the Tonle Sap river becomes so swollen with water that it reverses the direction of its flow and flows upstream to Tonle Sap lake.  The festival marks the switching, signifying the end of the rainy season.  Essentially, the festival is a time to give thanks to the rivers as they provide the region with fertile farming land and plenty of fish.

Peace Day in Cambodia is a relatively new national holiday celebrated on December 29th every year.  It commemorates the end of the Cambodian Civil War and the lasting peace that followed.