David Ian Liddell-Grainger, Baron of Ayton, KStJ, DL, FSA Scot (26 January 1930 – 12 March 2007), a former English politician, was the son of Henry Liddell-Grainger and Lady Muriel Felicia Vere Bertie, daughter of Montague Bertie, 12th Earl of Lindsey.
He was educated at St Peter's College, Adelaide, and Eton College.