John Martin, English admiral and politician, Lieutenant Governor of Guernsey (born 1918)

Vice-Admiral Sir John Edward Ludgate Martin, was a Royal Navy officer and Lieutenant Governor of Guernsey.

The lieutenant governor of Guernsey is the representative of the British monarch in the Bailiwick of Guernsey, a Crown dependency of the British Crown. The role of the lieutenant governor is to act as the de facto head of state in Guernsey and as liaison between the governments of Guernsey and the United Kingdom. The holder of this office is also ex officio a member of the States of Guernsey but may not vote and, by convention, speaks in the Chamber only on appointment and on departure from post. The duties are primarily diplomatic and ceremonial. He has the authority to appointment two members of the board of governors of Elizabeth College and the Priaulx Library.