Custom Regulations

Free Import:
For 18 years old and over:

• 2 liters of wine;
• 400 cigarettes, or 100 cigars, or 400 grams of tobacco;
  free import for all passengers:
• 350 milliliters of perfume.
• medicines for personal use.
• Goods worth more than USD 100.- are subject to customs duty and taxes. Goods with a value of more than USD 300.- must be declared on a Customs Declaration Form.

Currency
Currency Import regulations:
Local currency: Riel-KHR.
Foreign currencies: up to a maximum of USD 10,000.- or equivalent is allowed. Exceeding amounts must be declared on arrival.

The information is provided from https://www.iatatravelcentre.com/KH-Cambodia-customs-currency-airport-tax-regulations-details.htm

This is current at the time of publishing and is subject to change without notice.