The 3rd Canadian Division is a formation of the Canadian Army responsible for the command and mobilization of all army units in the provinces of Manitoba, Saskatchewan, Alberta and British Columbia, as well as all units extending westwards from the city of Thunder Bay.

It was first created as a formation of the Canadian Corps during the First World War. It was stood down following the war and was later reactivated as the 3rd Canadian Infantry Division during the Second World War. The second iteration served with distinction from 1941 to 1945, taking part in the D-Day landings of 6 June 1944. A duplicate of the 3rd Canadian Division was formed in 1945 to serve on occupation duty in Germany, and was disbanded the following year.

In 2013, Land Force Western Area, a peacetime military organization in western Canada, was ordered to be redesignated as 3rd Canadian Division. On 6 June 2014, the 3rd Canadian Division adopted the insignia, traditions and history of the previous formations.[1] From the middle of 1916, the division has been identified by a distinctive French-grey patch worn on the uniforms of its soldiers.