Brigadier Julian St. Clair Holbrook CBE MC (7 August 1897 – 1980) was a British Army officer.

At the start of the Second World War Holbrook was instructor in gunnery, Home Forces.

He was the commanding officer of the 73rd Anti Tank Regiment Royal Artillery during the North African Campaign between 1942 and 1943.

He commanded the 6th Army Group Royal Artillery during the Allied invasion of Sicily and subsequently in mainland Italy.

He was mentioned in dispatches for a second time on 24 August 1944, and in December 1944 he was invested as a Commander of the Order of the British Empire.