伸口鱼（学名：Epibulus insidiator）为辐鳍鱼纲隆头鱼亚目隆头鱼科的一种。

本鱼分布于热带珊瑚礁海域，从印度洋非洲东岸至太平洋中部、北至日本琉球群岛、**以及南海诸岛等。

The slingjaw wrasse, Epibulus insidiator, is a species of wrasse native to the tropical waters of the Indo-Pacific from the Red Sea and the African coast to the Tuamotus and Hawaii, and from the southern waters of Japan to New Caledonia. This species can be found on coral reefs at depths from 1 to 42 m (3.3 to 137.8 ft). The jaws of this species can swing out to form a long tube when opened (up to half the length of the fish's body) which creates suction to allow the fish to ingest the small crustaceans and fishes upon which it preys. It can reach a standard length of 54 cm (21 in). This species is of minor importance to local commercial fisheries and can be found in the aquarium trade.