Passports from Indonesia, Laos, Malaysia, Myanmar, Phillipines, Singapore Thailand and Vietnam can visit without a visa.

You may obtain your visa upon arrival at the two airports in Cambodia: Siem Reap and Phnom Penh, along with most border crossings. You will need US$20 cash for a tourist visa and US$25 for business. You will also need one passport size photo and your passport must be valid for six month from the date of entry.

A visa can be issued upon arrival at the border checkpoints into Cambodia.
Thailand: Cham Yeam (Koh Kong), Chorm (Oddar Meanchey), Daung (Kamrieng Battambang), Poi Pet (Banteay Meanchey), Prom (Pailin), O Smach (Oddar Meanchey).
Vietnam: Bavet (Svay Rieng), Kaoam Samnor (Kandal Mekong), Phnom Den (Takeo), Trapaing Sre (Kratie).
Laos: Dong Kralo (Stung Treng).
There is also an entry at Sihanoukville if you arrive by sea.

Passport holder from Afghanistan, Algeria, Arab Saudi, Bangladesh, Iran, Iraq, Nigeria, Pakistan, Sri Lanka and Sudan need to arrange a visa at an embassy prior to arriving.
Cambodia visa information

Cambodia has recently started an e-visa service which allows you to pay online using a credit card instead of handling cash at the airport.

The e-visa is only for use at Phnom Penh International airport, Siem Reap International airport and some of the land borders. It costs eight dollars more than paying cash at the airport. 

Cambodia e-visa

Last updated: 20 Sep 2013