Major-General Marshall St John Oswald CB CBE DSO MC was a British Army officer who served as Director of Military Intelligence.

[1] He served in the Second World War during which he was awarded the Military Cross[2] and the Distinguished Service Order.

[3] After the War he became Chief of Staff for I (BR) Corps in 1959 and Director of Military Intelligence in June 1962, in which capacity he dealt with the defection of the intercept operator Brian Patchett,[4] before retiring in 1965.

[5] He was appointed a Commander of the Order of the British Empire in the 1961 Birthday Honours.

[6] and a Companion of the Order of the Bath in the 1965 New Year Honours.