Nisida is a volcanic islet of the Flegrean Islands archipelago, in southern Italy. It lies at a very short distance from Cape Posillipo, just north of Naples; it is now connected to the mainland by a stone bridge. The islet is almost circular, with a flooded crater forming the bay of Porto Paone on the southwest coast. It has a diameter of about 0.5 kilometres and a highest altitude of 105 metres.
The name of the island comes from the Greek for "islet", νησίς, for which the accusative was nesida.
Address 80124, Italy
Coordinates 40°47'43.001" N 14°9'47.999" E