Lieutenant-Commander John Michael Avison Parker, CVO, AM (1920 – 2001) was an officer of the Royal Australian Navy (RAN), and served as Private Secretary to the Duke of Edinburgh between 1947 and 1957. The son of Captain C. A. Parker, CBE RAN, he was educated at Xavier College, Melbourne. He served in the Royal Australian Navy, and then the Royal Navy, between 1938 and 1947, reaching the rank of Lieutenant-Commander. Posts during this time included First Lieutenant of HMS Lauderdale in 1942, then of HMS Wessex in the 27th Destroyer Flotilla of the British Pacific Fleet.