Khao Sam Muk (Thai: เขาสามมุข, pronounced [kʰǎw sǎːm múk]), is a 45 m (147.64 ft) high hill in Chonburi Province, Thailand.

It is in Chonburi city on Bangkok Bay between Ang Sila and Bang Saen Beach.

One legend tells that the wife of a fisherman waited on the hill for her husband who was lost at sea.

Another legend tells that in the 18th century a poor Chinese girl named Sam Muk jumped to her death from the cliff after her parents objected to her marriage to her lover, becoming deified after her death.

Sam Muk hill appears in somewhat stylized form in the provincial seal of Chonburi.