This list consists of all major[a] naval and merchant ships involved in Operation Dynamo, the evacuation of allied troops from the Dunkirk area from 26 May to 4 June 1940.
The operation was administered by the British Admiralty with the Royal Navy providing the bulk of large vessels.
They were accompanied by several other vessels of allied navies, most notably the French, as well as many merchant ships, some previously requisitioned and converted for naval use, and others called into service from their civilian roles due to the urgency of the situation.
These were generally displayed on the ship's hull, though not on destroyer leaders such as HMS Montrose pennant D1.
The Blue Ensign was used for non-naval vessels in Government service, for example hospital ships and troopships.