Major General Ian David Erskine, CB, CBE, DSO (17 March 1898 – 27 July 1973) was a senior British Army officer.

He was the grandson of Sir Henry David Erskine and the great-grandson of Francis Seymour, 5th Marquess of Hertford.

[1] Erskine commissioned into the Scots Guards on 1 May 1917 and in August was deployed to the Western Front.

In September 1933 Erskine was promoted to major and between 1933 and 1935 undertook training at the Staff College, Camberley.

Between February and October 1941 he was commander of the 22nd Guards Brigade in Egypt, during which time he was Mentioned in Despatches and awarded the Distinguished Service Order.