Adrian Carnegie Slade CBE (born 25 May 1936), is a British Liberal Democrat politician and advertising agency founder. He was educated at Trinity College, Cambridge, where he became President of the Footlights, and famously recruited Peter Cook to the society. He served as the last President of the Liberal Party, from 1987 to 1988, conducting its merger negotiations with the SDP. He was vice-president of the Liberal Democrats 1988–89. He has two children, Nicola and Rupert, with his wife Sue.