The15th Destroyer Flotilla, or Fifteenth Destroyer Flotilla, was a naval formation of the British Royal Navy from August 1916 to March 1919 and again from September 1939 to May 1945.

The flotilla was first established in August 1916 and was attached to the Grand Fleet till March 1918.

[1] It was then transferred to the Battle Cruiser Force until it was disbanded in March 1919.

At the outset of the war the flotilla was reformed under the Commander-in-Chief, Rosyth from September to October 1939.

[2][3] It was then transferred to the Western Approaches Command[4] at Plymouth until January 1941.