Sir Gavyn Farr Arthur KStJ (13 September 1951 – 16 May 2016) was a British judge and prominent figure in the City of London who served as the 675th Lord Mayor from 2002 to 2003.

The only surviving son of Major Leonard Arthur, JP, by his wife Raina née Farr, he was educated at Harrow School before going up to Christ Church, Oxford.

He was a Past Master of the Worshipful Company of Gardeners, the Worshipful Company of Wax Chandlers, the Guild of Public Relations Practitioners, and the Guild of Freemen of the City of London.

In the United Kingdom, he was appointed by the Queen a Knight Bachelor in the 2004 New Year Honours[5][6] in recognition of his services to the City of London, and a Knight of Justice (2003) in the Venerable Order of St John.

In 2013 he was appointed Knight Commander of the Royal Order of the Crown by King Michael I of Romania and in 2016 received the Medal of the President of the Slovak Republic for his services to British-Slovak relations.