'Quaker' was a British and Canadian cover plan for Lieutenant General Sir Miles Dempsey’s British 2^nd Army and General H. D. G. Crerar’s Canadian 1^st Army as they readied themselves for the start of 'Overlord' (May/June 1944).

Not a part of 'Fortitude', 'Quaker' was the British and Canadian counterpart of the US 'Williams' and was thus designed to obviate radio silence before D-Day, cover the movement of the assault formations to their embarkation ports, and avoid any extended periods of radio silence should anything cause the postponement of 'Overlord'.