Kenneth Peter Lyle Mackay, 4th Earl of Inchcape (born 23 January 1943), known as Peter Inchcape, is an earl in the Peerage of the United Kingdom. He owns an estate in Scotland at Carlock House, Glenapp, Ballantrae, Girvan, Ayrshire, and also has houses in London and at Clyffe Pypard near Swindon, Wiltshire, England. He is a descendant of Cornelius Vanderbilt.