An archaeological evaluation was undertaken by Cotswold Archaeology in February and March 2016 at Thornbury Castle, Thornbury, South Gloucestershire. Twelve trenches were excavated. The evaluation has demonstrated that structural remains relating to the historic development of Thornbury Castle and its environs survive in parts of the West Range, Kitchen Garden and Kitchen Court. An undated ditch, probably relating to agricultural land management was identified in Trench 5. A series of undated make-up/levelling deposits were observed sealing the identified structural remains in the Kitchen Court and, although undated, these are likely to relate to post-medieval and later redevelopment of the castle.