John Holmes Jellett Officer of the Order of the British Empire (OBE), DSc, MA (20 April 1905 – 17 June 1971) was a British civil engineer. Jellett started his career as a bridge and canal engineer before joining the Admiralty, where he specialised in docks. He made improvements to the Royal Navy dockyards and depots at Chatham, Singapore, Devonport, Gibraltar and Milford Haven in the 1930s. During the Second World War Jellett was responsible for works in Egypt and Malta as superintendent civil engineer for the Eastern Mediterranean. After service in the Mediterranean, he was superintending engineer for Mulberry Harbour B that supplied the allied forces in France after the Normandy Landings. Jellett was appointed an OBE for this work in late 1944. After the war he worked for the Southern Ra