Matthew White Ridley, 5th Viscount Ridley DL FRSL FMedSci (born 7 February 1958), commonly known as Matt Ridley, is a British journalist and businessman. Ridley is best known for his writings on science, the environment, and economics. He has written several science books including The Red Queen: Sex and the Evolution of Human Nature (1994), Genome (1999), The Rational Optimist: How Prosperity Evolves (2010) and The Evolution of Everything: How Ideas Emerge (2015). He publishes a blog, and is a regular contributor to „The Times“ newspaper.
Ridley is a libertarian, and a staunch supporter of Brexit. Since 2013, he has been a Conservative hereditary peer, with a seat in the House of Lords.
Ridley was chairman of the UK bank Northern Rock from 2004 to 2007, during which period Northern Rock experienced the first run on a British bank in 150 years. Ridley chose to resign, and the bank was bailed out by the UK government leading to the nationalisation of Northern Rock.