John Anthony Dyson, Lord Dyson, PC (born 31 July 1943) is a former British judge and barrister. He was Master of the Rolls and Head of Civil Justice, the second most senior judge in England and Wales, from 2012 to 2016, and a Justice of the Supreme Court of the United Kingdom from 2010 to 2012. He was the first justice to be appointed who was not a peer.