Sir Ian Edward Lamert Davis (born 10 March 1951) is an English businessman, best known for his role as managing director of McKinsey & Company. He succeeded Rajat Gupta on 1 July 2003. He joined McKinsey in 1979 retired in 2010, after 7 years at Bowater and is a senior partner emeritus. Davis was born in Kent, England. Prior to becoming managing director, he was office manager of McKinsey's London and UK office. He has an undergraduate degree in Philosophy, Politics and Economics from Balliol College, University of Oxford. He is the brother of former Reed Elsevier chairman Crispin Davis. His twin brother is Sir Nigel Davis, a Court of Appeal judge. He is currently chairman of Thoughtworks. Davis was a Non-Executive Director at Johnson & Johnson, BP, Teach For All, Big Society Trust and He is a Senior Adviser to Apax Partners and Majid Al Futtaim Group. Davis was knighted in the 2019 Birthday Honours for services to business.

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