St. Catherine's Hill is a small but dramatic chalk hill to the south east of Winchester in Hampshire, England. Rising steeply some 67m from the water meadows of the River Itchen, the summit of the hill at 97m provides a fine view over Winchester.The hill is owned by Winchester College, and largely managed as a nature reserve by the Hampshire and Isle of Wight Wildlife Trust. St. Catherine's Hill is at the westernmost extremity of the South Downs National Park, having previously been designated as part of the East Hampshire AONB (Area of Outstanding Natural Beauty). In addition, much of the hill and adjoining Plague Pits dry valley is designated as a Site of Special Scientific Interest (SSSI) due to its chalk downland flora, including 'practically the full range of downland orchids', with chalkhill blue and other butterflies.HistoryThe top of the hill is ringed by the ramparts of an Iron Age hill fort, which is a scheduled ancient monument. In the centre a copse of beech trees contains the site of the 12th-century chapel of St. Catherine. There is also a mizmaze, probably cut between 1647 and 1710.