Pang Sida National Park (Thai: อุทยานแห่งชาติปางสีดา, RTGS: Utthayan Haeng Chat Pang Sida, pronounced [ʔùt.tʰā.jāːn hɛ̀ŋ t͡ɕʰâːt pāːŋ sǐː.dāː]) is a national park in the Sankamphaeng Range, covering 527,500 rai ~ 844 square kilometres (326 sq mi)[1] in the eastern Thai province of Sa Kaeo.

It is 28 kilometres north of Sa Kaeo City, the capital of the province.

Together with Khao Yai National Park, Thap Lan National Park, Ta Phraya National Park and the Dong Yai Wildlife Sanctuary, it constitutes a part of the Dong Phayayen Forest Complex UNESCO World Heritage Site, covering in total around 6,100 square kilometers.

The critically endangered Siamese crocodile Crocodylus siamensis is reported to live in the park, along with the Asian elephant, gaur, dhole (the IUCN [4] estimates fewer than 2,500 adults of this wild dog worldwide), leopard, Malayan sun bear, Asiatic black bear and white-handed gibbon.

[5] Approximately 6 kilometres further one can stop and travel by foot to the Gaur grassland, where a wildlife tower is located for observation.