Report on a series of archaeological surveys, conducted to inform the conservation and management of Tattershall Castle. The project comprised earth resistance, vertical electrical section and magnetometry geophysical surveys, and an augering survey, conducted within the castle grounds, and in the meadow areas to the east and south. The remains of probable former structures within the inner and outer wards of the castle were recorded, along with structures likely associated with the former Tattershall College to the east. The possible course of the outer castle moat was also recorded in the area known as the Tiltyard, along with a number of probable former fishponds in the meadowland to the south-east of the castle.