Gaiola Island is one of the minor islands of Naples, Italy; it is offshore of Posillipo and gives its name to the Underwater Park of Gaiola (Parco Sommerso di Gaiola), a protected marine area.

The island takes its name from the cavities that dot the coast of Posillipo (from the Latin cavea, "little cave", and then through the dialect "Caviola"). Originally, the small island was known as Euplea, protector of safe navigation, and was the site of a small temple. Sources