The 4th Canadian Infantry Brigade was an infantry brigade of the Canadian Army active during World War I and World War II. Raised in 1915, the brigade formed part of the 2nd Canadian Division and fought on the Western Front between 1916 and 1918. The brigade was re-raised in 1939 for service during World War II and subsequently took part in actions at Dieppe in 1942 and then in north-west Europe during 1944 and 1945.