The 9th Destroyer Flotilla, or Ninth Destroyer Flotilla, was a military formation of the British Royal Navy from January 1913 to December 1925 and again in January to July 1940.

Established in January 1913 when it was assigned to the Patrols Command it was based at Chatham.

[1] During World War I it remained on Patrolling Duties until 1918.

[3] It was reformed during World War II in January 1940 as part of the Home Fleet destroyer flotillas command until July 1940 when it was disbanded.

[4] Captain (D) afloat is a Royal Navy appointment of an operational commander of a destroyer flotilla or squadron.