Preah Vihear (, UNGEGN: PreÃÂh VÃÂhar, ALA-LC: Braḥ VihÃÂr ; <small>lit. 'sacred sanctuary'</small>) is a province (khaet) of Cambodia. It borders the provinces of Oddar Meanchey and Siem Reap to the west, Kampong Thom to the south and Stung Treng to the east. Its northern boundary forms part of Cambodia's international border with Thailand and Laos. Its capital is Preah Vihear.
The province is named after Preah Vihear, a Khmer temple. The Dângrêk Mountains and the Cambodia/Thailand border are in the north of Preah Vihear province.
Preah Vihear is one of the nine provinces that are part of the Tonle Sap Biosphere Reserve.
On 15 April 2016, Preah Vihear recorded a temperature of , which is the highest temperature to have ever been recorded in Cambodia.
The province is divided into seven districts and one municipality, further divided into 51 communes.
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The Prey Lang Wildlife Sanctuary spans multiple provinces including Preah Vihear, and the sanctuary landscape has been used for a registered REDD+ project under JapanâÂÂs Joint Crediting Mechanism involving Conservation InternationalâÂÂs Cambodia programme.