Nai Han (หาดในหาน Hat Nai Han), more commonly spelled and pronounced, Nai Harn, is a village and a beach of the same name at the southernmost tip of Phuket, near Phromthep Cape. The northeastern bit of Nai Han is Ao Sen (อ่าวเสน-Sen Bay).

Some 18 kilometres from Phuket Town, south of Kata Noi and north of Phromthep Cape, Nai Harn is not Phuket’s longest beach, but it borders the most gorgeous lagoon on the island. The middle of the beach is dominated by the Nai Han monastery, which has prevented excessive development and is the reason that the beach is generally less crowded than other spots on the southern part of the island.