This was a British unrealised initial plan conceived by Vice Admiral the Lord Louis Mountbatten’s Combined Operations Headquarters for an Anglo-Canadian force to undertake a 'seize, examine and withdraw' assault on the town of Dieppe on the southern side of the English Channel in German-occupied France (April/June 1942).

The operation was schemed from April 1942 for implementation at the end of June or early in July, but was then postponed for weather reasons and finally abandoned. The belief expressed in the basic concept by Mountbatten then led to the resurrection of the notion in an expanded and revised form as 'Jubilee'.