Timothy Aidan John Knox, FSA (born 9 August 1962) is a British art historian and museum director. Since March 2018, he has been Director of the Royal Collection, the private art collection of the British Royal Family. The Royal Collection, held in trust by The King for his successors and the nation, comprises almost all aspects of the fine and decorative arts, runs to more than a million objects and is spread among some 15 royal residences and former residences across the UK. From 2013 to 2018, he was the Director of the Fitzwilliam Museum at the University of Cambridge.