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Ko Sarai (Thai: เกาะสาหร่าย, pronounced [kɔ̀ʔ sǎːràːj]) is a subdistrict (tambon) in Mueang Satun District, Satun Province, Thailand. It is composed of 3 island groups, totaling 243 km2, and has a population of 5077 as of 2012[citation needed] .
- The biggest village is Ban Ko Sarai (sometimes called Ban Yaratot Yai), on the island with the same name.
- The population relies on fishing, agriculture and tourism.
- Amongst the attractions, Ko Tarutao, Ko Lipe, Ko Adang.