Bang Khan (, ) is a district (amphoe) of Nakhon Si Thammarat province, southern Thailand.
Neighboring districts are (from the north clockwise): Thung Yai and Thung Song of Nakhon Si Thammarat; Ratsada, Huai Yot, and Wang Wiset of Trang province; and Lam Thap of Krabi province.
The district was created as a minor district (king amphoe) on 1 April 1984, when the three tambons Bang Khan, Ban Lamnao, and Wang Hin were split off from Thung Song district. On 9 April 1992, the minor district was upgraded to a full district.
The district is divided into four sub-districts (tambons), which are further subdivided into 60 villages (mubans). There are no municipal (thesaban) areas, and three tambon administrative organizations (TAO).