Caistor St Edmund is a village on the River Tas, near Norwich, Norfolk, England. It covers an area of 6.55 square kilometres (2.53 sq mi) and had a population of 270 in 116 households at the 2001 census, the population increasing to 289 at the 2011 Census. Caistor Old Hall was built in 1612 for Thomas Pettus. During the 19th century it was owned by John Spurrell (son of William Spurrell, of Thurgarton, Norfolk). The River Tas passes under Markshall bridge, just north of the Roman camp, and then flows on towards Arminghall and Trowse.