Walter John Francis Erskine, 12th Earl of Mar and 14th Earl of Kellie (29 August 1865 - 3 June 1955) was a Scottish nobleman.
The eldest son of Walter Erskine, 11th Earl of Mar and Mary Anne Forbes, he was educated at Eton and served as a 2nd lieutenant and then lieutenant in the Scots Guards from 1887–92.
He succeeded his father in 1888, and in 1892 married Lady Violet Ashley-Cooper, daughter of Anthony Ashley-Cooper, 8th Earl of Shaftesbury. They had three children:
He was a Scottish Representative Peer from 1892–1950, and held office as Lord Lieutenant of Clackmannanshire from 1898 and Lord Clerk Register and Keeper of the Signet from 1936–44. He was also Hereditary Keeper of Stirling Castle, and Honorary Colonel of the 7th Battalion Argyll and Sutherland Highlanders. He was successively Brigadier, Ensign, Lieutenant, and Captain in the Royal Company of Archers
He was appointed a Knight of the Thistle in the 1911 Coronation Honours and was Chancellor of the Order from 1932–49.[1] His son, John, having predeceased him, he was succeeded by his grandson, John Erskine, Earl of Mar and Kellie (1921-1993).