Major General Charles Gordon Hay, 20th Earl of Erroll, KT, CB, DL (7 February 1852 – 8 July 1927), styled Lord Kilmarnock until 1891,[1] was a Scottish soldier and Conservative politician.

Sir Charles Stephen Gore, a Waterloo officer (who was a son of the 2nd Earl of Arran and brother to the Duchess of Inverness).

[3] In early March 1900 he took command of a yeomanry brigade in the South Africa Field Force, with the rank of brigadier general.

[4] He was later an honorary major general in the British Army and a lieutenant colonel commanding the Royal Horse Guards.

Through his eldest son, and heir, Victor, he was a grandfather of Josslyn Hay, 22nd Earl of Erroll (who married Lady Myra Sackville, daughter of the Earl De La Warr),[8] Gilbert Boyd, 6th Baron Kilmarnock (who married firstly The Hon.