The 9th Canadian Infantry Brigade was an infantry brigade of the Canadian Army that saw active service during World War I and World War II as part of the 3rd Canadian Infantry Division. The brigade fought on the Western Front during World War I from January 1916 to November 1918, and in Normandy and north-west Europe in 1944–1945 during World War II. It was a square formation of four infantry battalions during World War I, but was reduced to a triangular formation of three battalions during World War II.

Major General John Meredith Rockingham,, nicknamed "Rocky," was an Australian-Canadian senior military officer who fought with the Canadian Army in World War II and the Korean War. In 1940 Rockingham went overseas as a lieutenant with the Canadian Scottish Regiment, but after the Dieppe Raid of August 1942 he was transferred to the Royal Hamilton Light Infantry (RHLI) and promoted to major. Following the invasion of Normandy in June 1944, Rockingham played a significant role in Operation Overlord and the North West Europe Campaign both as Commanding Officer of the RHLI and as General Officer Commanding the 9th Canadian Infantry Brigade. Rockingham returned to civilian life in 1946, obtaining a job with the British Columbia Electric Railway. However, in 1950 he was recalled by the military to command the 25th Canadian Infantry Brigade in the Korean War. After his stint as a brigadier in Korea ended, Rockingham returned to Canada where he remained in the military until 1966. Rockingham died in British Columbia in 1987 at age 75.