Ao Siam National Park
IUCN category II (national park)
Location of the Ao Siam National Park
Location	Mae Ramphueng Subdistrict, Bang Saphan District, Prachuap Khiri Khan Province, 77140, Thailand
Coordinates	11°12′37″N 99°31′23.4″E / 11.21028°N 99.523167°E / 11.21028; 99.523167
Area	31.94 km2 (19960.03 rai)
Established	Preparing (open some sources)
Governing body	Department of National Parks, Wildlife and Plant Conservation

Ao Siam National Park (Thai: อุทยานแห่งชาติอ่าวสยาม, RTGS: Utthayan Haeng Chat Ao Sayam, pronounced [ʔùt.tʰā.jāːn hɛ̀ŋ tɕʰâːt ʔàːw sā.jǎːm]) is a national park that is preparing to reopen in Thailand. It is an area on the western coast of the Gulf of Thailand covering the Pa Klang Ao Forest Park, Mae Ramphueng Forest Park, Koh Talu, Koh Sing, and Koh Sanghk, Bang Saphan District Prachuap Khiri Khan Province. Which the three islands are 8 kilometers from the coast, 6 kilometers, and 5 kilometers, respectively. There are also some areas located in the drafting area of the Ministry of Natural Resources and Environment (Thailand) regarding environmental protection measures in some areas of Thap Sakae District, Kui Buri District, Sam Roi Yot District, Mueang Prachuap Khiri Khan District, Bang Saphan District, and Bang Saphan Noi District Prachuap Khiri Khan Province.^[1][2]

• Official website of Ao Siam National Park
• Official Facebook page of Ao Siam National Park