Lieutenant General Michael George Henry Barker was a British Army officer who fought in both world wars, notably as commander of I Corps during the Battle of France in May 1940.

I Corps was an army corps in existence as an active formation in the British Army for most of the 80 years from its creation in the First World War until the end of the Cold War, longer than any other corps. It had a short-lived precursor during the Waterloo Campaign. It served as the operational component of the British Army of the Rhine during the Cold War, and was tasked with defending West Germany.