Itoshima (糸島市, Itoshima-shi) is a city located in the western area of Fukuoka Prefecture, Japan. The city was formed on January 1, 2010, following the merger of the city of Maebaru with the two towns of Shima and Nijo.

As of June 30, 2011, the city has an estimated population of 100,304, with 37,132 households and a population density of 464.11 persons per km². The total area is 216.12 km².