William Matthew Wand Addison, 4th Viscount Addison (born 13 June 1945), is a British peer. The son of Michael Addison, 3rd Viscount Addison, he succeeded the Viscountcy on the death of his father in 1992. He was educated at Westminster School and King's School, Bruton. On 10 October 1970, he married Joanna Mary Dickinson, with whom he had the following children: * Hon. Sarah Louise Addison (b. 1971) * Hon. Paul Wand Addison (b. 1973) * Hon. Caroline Amy Addison (b. 1979) In 1991, he married Lesley Ann Mawer.