The Art Treasures of Great Britain was an exhibition of fine art held in Manchester from 5 May to 17 October 1857. It remains the largest art exhibition to be held in the UK, possibly in the world, with over 16,000 works on display. It attracted over 1.3 million visitors in the 142 days it was open, about four times the population of Manchester at that time, with many visiting on organised railway excursions. Its selection and display of artworks had a formative influence on the public art collections which were being established in the UK at the time, such as the National Gallery, the National Portrait Gallery and the Victoria and Albert Museum.