那不勒斯湾是位于意大利南部坎帕尼亚大区那不勒斯省，其西侧向地中海敞开，北面有那不勒斯和波佐利等城市，东面是维苏威火山，南面是索伦托半岛及其主要城镇索伦托，以此与萨莱诺湾隔开。被谕名为世界三大夜景之一．

那不勒斯湾有普罗奇达岛、卡普里岛和伊斯基亚岛等岛屿。这一地区是意大利重要的旅游区，拥有罗马帝国的庞贝和赫库兰尼姆古城废墟（毁于公元79年维苏威火山爆发）。

The Gulf of Naples (Italian: Golfo di Napoli), also called the Bay of Naples, is a roughly 15-kilometer-wide (9.3 mi) gulf located along the south-western coast of Italy (province of Naples, Campania region). It opens to the west into the Mediterranean Sea. It is bordered on the north by the cities of Naples and Pozzuoli, on the east by Mount Vesuvius, and on the south by the Sorrentine Peninsula and the main town of the peninsula, Sorrento. The Peninsula separates the Gulf of Naples from the Gulf of Salerno, which includes the Amalfi coast.