| Unit Name: | 8th Destroyer Flotilla |
| Dates: | August 1911 – May 1939 |
| Country: |  United Kingdom |
| Size: | Flotilla |
| Commander1: | Commander Charles Wills |
| Commander1 Label: | First |
| Commander2: | Captain Harold Hickling |
| Commander2 Label: | Last |
The 8th Destroyer Flotilla, also styled as the Eighth Destroyer Flotilla, was a military formation of the British Royal Navy from 1911 to 1939.
The flotilla was established in August 1911. In 1912 it was assigned to the Admiral of Patrols command and was based at Chatham Dockyard. For the duration of World War I it was on patrol duties. Post First World War it was transferred to the Mediterranean Fleet from 1921 to 1924. In 1925 it was reassigned to the China Station where it remained just before the Second World War in May 1939 when it was renamed 21st Destroyer Flotilla. It was first commanded by Commander Charles Wills and last commanded by Captain Harold Hickling.
Captain (D) afloat is a Royal Navy appointment of an operational commander of a destroyer flotilla or squadron.