O'Yadav National Park is a national park in northeastern Cambodia, in Ratanakiri province. It was established in 2016, and its boundaries were revised in 2023; the park covers .
The park includes forested areas in Ratanakiri province. A temple site known as Yak Nang is located in O'Yadav National Park and was discovered in 2006.
O'Yadav National Park was established on 9 May 2016 by Sub-decree No. 82, covering in Ratanakiri province.
In 2017, Cambodia established a national system of biodiversity conservation corridors under Sub-decree No. 07.
On 17 July 2023, Sub-decree No. 177 revised the boundaries of O'Yadav National Park, expanding it from to by incorporating an additional from the northeastern biodiversity conservation corridor system.