斯卡帕湾（Scapa Flow）是一块位于英国苏格兰地区最北端、奥克尼群岛（Orkney Islands）境内的半封闭水域，由该群岛里的主岛（Mainland）、霍伊岛（Hoy）、南罗纳赛岛（South Ronaldsay）与一干小岛包围，是一良好的天然海湾，而今日则是一个著名的战争遗迹游览胜地。

从古代的维京人时代开始，斯卡帕湾就一直是军舰频繁进出的区域，并且曾在第一次与第二次世界大战期间，被英国作为围堵敌对势力进入大西洋地区的主要基地。这历史一直延续到英国皇家海军于1956年时关闭此处的军港为止。

Scapa Flow (/ˈskɑːpə/ or /ˈskæpə/; fromOld Norse Skalpaflói, meaning "bay of the long isthmus") is a body of water in the Orkney Islands, Scotland, United Kingdom, sheltered by the islands of Mainland, Graemsay, Burray, South Ronaldsay and Hoy. The Harbour Authority area of Scapa Flow in Orkney has been measured as part of a wider consultation in ballast water management in 2013, and it has been accurately calculated that Scapa Flow is 324.5 square kilometres (125.3 sq mi) in area and that this area contains just under 1 billion cubic metres of water. Scapa Flow is one of Britain's most historic stretches of water - located within the Orkney Islands, off the northeast coast of Scotland. Its sheltered waters have been used by ships since prehistory and it has played an important role in travel, trade and conflict throughout the centuries - especially during both World Wars. It is currently a world famous diving location with the wrecks of the scuttled German Fleet offering unique diving challenges. Scapa Flow is also a major oil port and served the Flotta Oil Terminal and is a prime location of ship-to-ship transfers of crude oil product and liquefied natural gas (LNG). The world’s first ship to ship transfer of LNG took place in Scapa Flow in 2007.