Khao Nan National Park () is a national park in Nakhon Si Thammarat province, Thailand. The park is home to tropical forests, waterfalls and caves.
Geography
Khao Nan National Park is in the Tha Sala, Sichon and Nopphitam districts of Nakhon Si Thammarat province. It is about from Tha Sala village. The park's area is .
The highest point is Khao Nan peak at , part of the Nakhon Si Thammarat Range. The park is bordered by Khao Luang and Tai Romyen National Parks.
Attractions The park's largest waterfall is Sunantha. Other park waterfalls include Krung Nang, Khlong Talik and Khao Dai. Trails include the Bua Chaek Yai Nature Trail and in 2026 the new Yod Khao Khom Trail opened, leading to the summit of Khao Khom. The park hosts a number of caves including Hong and Krung Nang.
Flora and fauna Plant species in the park include Dipterocarpus alatus, Elateriospermum tapos, Hopea odorata, Intsia palembanica and Parashorea stellata. Elateriospermum tapos occupies an area of about , which turns red each year from February to April. Also present are fern species including Cheiropleuria.
The park is home to two endemic lizard species, Pseudocalotes khaonanensis and Larutia nubisilvicola. Both are known only from an area of cloud forest at about elevation. Other animal species include serow, Malayan tapir and civet.
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