Matthew White Ridley, 5th Viscount Ridley (born 7 February 1958), is a British science writer, journalist and businessman. He is known for his writings on science, the environment, and economics, and has been a regular contributor to The Times newspaper. Ridley was chairman of the UK bank Northern Rock from 2004 to 2007, during which period it experienced the first run on a British bank in 130 years. He resigned, and the bank was bailed out by the UK government; this led to its nationalisation. Ridley is a libertarian, and a staunch supporter of Brexit. He inherited the viscountcy in February 2012 and was a Conservative hereditary peer from February 2013, with an elected seat in the House of Lords, until his retirement in December 2021.