York Castle Museum is a museum in the city of York, England founded in 1938 by John L. Kirk and John Bowes Morrell. It was inaugurated in 1938 and is housed in the prisons of the city castle. The museum houses a collection dedicated to the culture and folklore of the town of Pickering.

In the interior spaces of the museum a Victorian street (the Kirkgate) is reconstructed complete with all the shops, a cottage typical of the Pickering moors, a dining room from the James I period and the cell of the bandit Dick Turpin. There are also some knick-knacks dating back to the early 19th century. Among the pieces in the collection stands out the York Helmet, found in 1982 and considered the most precious of the three Anglo-Saxon helmets recovered to date. The collection was initially assembled by Kirk who brought what he had collected from the 1890s to the Pickering Memorial Hall. The artifacts were later offered by Kirk to other museum institutions. York Castle Museum was expanded in 1952 with the addition of a new area in 1952.