Vice Admiral Sir Peter William Gretton KCB, DSO**, OBE, DSC (27 August 1912 – 11 November 1992) was an officer in the Royal Navy.

[2] From 22 April 1943 to 6 May 1943, Commander Gretton led Escort Group B7 in covering Convoy ONS 5, considered to be the turning point of the Battle of the Atlantic.

[3] On the return voyage Commander Gretton and Escort Group B7 successfully covered Convoy SC 130, with no losses to enemy action and an on-time arrival that allowed his wedding to happen as scheduled.

[4] Gretton continued in command of Escort Group B7 until the summer of 1944, when it was disbanded as part of the preparations for Operation Neptune, the naval portion of the Normandy invasion.

[1] Promoted to rear-admiral on 7 July 1958, he became Senior Naval Member of the Directing Staff at the Imperial Defence College in 1958 and Flag Officer Sea Training in 1960.

[11] He received the Distinguished Service Order and Two Bars; the first in 1942 for Operation Pedestal;[12] the second in 1943 for the defence of ONS 5;[13] and the third in late 1943 for the actions as support group leader.