Kathu (Thai: กะทู้, pronounced [kā.tʰúː]) is a district (amphoe) of Phuket province, Thailand.

It borders Thalang to the north, Mueang Phuket to the east and south, and the Andaman Sea to the west.

[2] During the King Mongkut (Rama IV)'s regin in early Rattanakosin period, Kathu has experienced tragedy when two Chinese triad gangs were killed here.

Nowadays, a shrine has been established to dedicate to them, named Tong Yong Su (Chinese: 忠勇祠; pinyin: zhōngyǒng cí), which means "the shrine of courageous and upright ancestors".

Patong has town (thesaban mueang) status, Kathu has sub-district municipality (thesaban tambon) status, and Kamala is led by a tambon administrative organization (TAO).