The Flag Officer Scotland and Northern Ireland (FOSNI) was a senior post in the Royal Navy of the United Kingdom. It was based at HM Naval Base Clyde, and the holder of the post was the Royal Navy’s senior officer in Scotland. The post of FOSNI, dating from 1946, was re-scoped and re-named in 1994 to Flag Officer Scotland, Northern England & Northern Ireland (FOSNNI), then named back in 2015, before being dis-established in 2020.[why?]
The Flag Officer Scotland and Northern Ireland was the most senior naval position in Scotland and is the successor to appointments starting with the Commander-in-Chief, Rosyth, established in 1913, just prior to the outbreak of the First World War. From 1946 the post became the Flag Officer Scotland & Northern Ireland. Between 1961 and 1994 the Flag Officer Scotland and Northern Ireland was triple-hatted as Commander Northern Sub-Area (NORLANT) of Allied Command Atlantic (ACLANT), and as Commander Nore Sub-Area Channel (NORECHAN) of Allied Command Channel. Based at RAF Pitreavie Castle, NORECHAN was tasked to prevent Soviet Navy ships and submarines from entering the North Sea. When the command moved from Rosyth to HMNB Clyde in 1994, it took responsibility for a larger area, becoming the Flag Officer Scotland, Northern England and Northern Ireland. In 2015 the post reverted to Flag Officer Scotland and Northern Ireland. The post was removed under the Royal Navy's Navy Command Transformation Programme and renamed Commodore Submarine Service (COSM).