Admiral Sir Edwyn Sinclair Alexander-Sinclair, GCB, MVO (born Alexander; 12 December 1865 – 13 November 1945) was a Scottish Royal Navy officer, notable for firing the first shots of the Battle of Jutland, and for leading a squadron of light cruisers in the Baltic to support independence of Estonia and Latvia in 1918 to 1919.

[7] He then had two sea commands, the destroyer Albatross from February 1902[9] serving at the Mediterranean Station from May that year; and after paying her off in January 1904, the despatch vessel Surprise until 1905.

[7] On 31 May 1916 it was the 1st Light Cruiser Squadron under Alexander-Sinclair that first engaged scouting vessels of the German High Seas Fleet and signalled "enemy in sight", leading to the Battle of Jutland,[11] after which he received a mention in dispatches from Vice Admiral Sir David Beatty, commander of the Battlecruiser Fleet, and the Russian Order of St. Vladimir, Third Class with Swords.

In November 1918 Alexander-Sinclair was given the honour of leading the surrendered German Fleet into internment at Scapa Flow,[11] and appointed a Knight Commander of the Order of the Bath.

Alexander-Sinclair then blockaded the Russian Navy base at Kronstadt[1] until relieved by the 1st Light Cruiser Squadron under Rear-Admiral Walter Cowan.