牙买加海湾（英语：Jamaica Bay），是位于美国纽约州长岛西南部，大西洋边的一个浅水湾，面积50平方公里（20平方哩），为纽约港之一部。其西半部属布鲁克林区，东半部属皇后区。

海湾南有洛克威半岛屏蔽，克罗斯湾大道则横跨其上。多沼泽岛屿，西南侧透过狭窄的洛克威海峡与大西洋连接。科尼岛位居入口道附近。弗洛伊德贝涅特机场位于布鲁克林岸上，为美国海军航空站。位于爱得怀尔德（Idlewild）的甘迺迪国际机场则在其东北岸。

Jamaica Bay is located on the southern side of Long Island, in the U.S. state of New York, near the island's western end. The bay connects with Lower New York Bay to the west through Rockaway Inlet and is the westernmost of the coastal lagoons on the south shore of Long Island. Politically, it is divided between the boroughs of Brooklyn and Queens in New York City, with a small part touching Nassau County.