Eustace Sutherland Campbell Percy (21 March 1887 – 3 April 1958), known as Lord Eustace Percy from 1899-1953 and as the 1st Baron Percy of Newcastle, of Etchingham in the County of Sussex from 1953, was a Conservative Party politician. A son of the 7th Duke of Northumberland, he served a single three-year term as a Municipal Reform Party member of the London County Council representing Holborn from 1919-22.