Vice-Admiral Kenneth Gilbert Balmain Dewar, CBE, RN (21 September 1879 – 8 September 1964) was an officer of the Royal Navy. After specialising as a gunnery officer, Dewar became a staff officer and a controversial student of naval tactics before seeing extensive service during the First World War. He served in the Dardanelles Campaign and commanded a monitor in home waters before serving at the Admiralty for more than four years of staff duty. After the war ended he became embroiled in the controversy surrounding the consequences of the Battle of Jutland. Despite this, he held a variety of commands during the 1920s.